Xiao Ming read a story book. On the first day, he read 24 pages, accounting for one fifth of the whole book. On the second day, he read 37.8% of the whole book, and the rest was the third page Xiao Ming read a story book. On the first day, he read 24 pages, accounting for one fifth of the whole book. On the second day, he read 37.8% of the whole book. On the third day, he finished reading the rest. Please help Xiao Ming calculate. What page should he read on the third day? (whole process, explanation) The youth newspaper has 85 employees, and the ratio of male and female employees is 2:3. In order to expand the scale of the newspaper, the newspaper has recruited some male employees through the Internet, which accounts for 49% of the total number of newspaper employees. Please use your brains to calculate how many male employees the newspaper has recruited! (whole process, explanation) Master Zhang drove from Shijiazhuang to Beijing. When the car reached 230km away from Beijing, he saw from the fuel meter and odometer that he had driven 50km, consumed 60L of gasoline, and there was 30L left in the fuel tank. Driving in this way, did you have enough fuel in the fuel tank when you arrived in Beijing Grandfather's tea shop has just entered a batch of cylindrical tea boxes. Xiao Ming measured out from the outside that the bottom diameter of each tea box is 10cm and the height is 15cm. He wants to design a rectangular box that can hold four tea of the above specifications. Can you help him? (1) There are () different designs (2) In these different designs, how many square centimetres is the least material used My volume is 282.6cm & # 178;, and it is fused into a cone with a radius of 6cm at the bottom. How high is the cone? (whole process, explanation) The edge length of each cube is a centimeter. What are the surface areas of the following figures? One () square centimeter two () square centimeter three () square centimeter fifty one () square centimeter (whole process, explanation) An unused cylindrical pencil is 18cm in length and 9cm in volume. After being used for a period of time, it turns into the following shape (no picture). Do you know the volume of this pencil now How many parts can be processed in the first batch? (compare with the total number of parts processed in the first batch, please explain) The fruit shop bought a batch of fruit. After Aunt Li sold part of the fruit, she knew that the ratio of the quality of the fruit sold to the quality of the remaining fruit was 2:7. If she sold another 64kg, the remaining fruit would be only three fifths of the original fruit of the fruit shop. Please help Aunt Li calculate how many kilograms of fruit the fruit shop bought? (whole process, explanation) In three stationery stores, the price of workbooks is 0.5 yuan per copy, but the preferential measures are different. Huafeng store: 10% discount for all; Zhongyang store: 5 copies get 1 free; Guanglong store: 20% discount over 55 yuan. Class 61 wants to buy 100 workbooks. Which store do you think it is more cost-effective to buy them? (whole process, explanation) Mr. Zhang said that the diameter of the curve in the inner ring of the sports ground is 30 meters, and the width of the whole track is 5 meters. How many cubic meters of slag do you need to lay 20 cm thick slag on the 5-meter-wide running track

So many questions are only 5 points?!
Hongxing factory manufactures a batch of parts. It plans to manufacture 200 parts every day, and finish them in 15 days. In fact, it overproduces 50 parts every day. How many days can we finish the task?
Total output: 15x200 = 3000
Actual days: 3000 / (200 + 50) = 3000 / 250 = 12 (days)
How much is 120 times 68?
Grade 4, right?
According to the teacher, it is:
120×68≈100×70=7000
If it is written as:
120 × 68 ≈ 120 × 70 = 8400 is OK
PS: my daughter is in grade 4. She asked her teacher a similar question two days ago
If it's about 8200, it's 8160
eight thousand and two hundred
Li Hong read a story book, the first day read 40 pages, (), the next day read a few pages? (only the formula does not calculate)
The next day saw 75% more than the first
The number of pages read the next day was 75% of the first day
The number of pages read on the first day is 75% less than that on the second day
I read 25% more pages on the first day than on the second
Li Hong read a story book, 40 pages on the first day, (), how many pages on the second day?
The next day saw 75% more than the first
40*(1+75%)=70
The number of pages read the next day was 75% of the first day
40*75%=30
The number of pages read on the first day is 75% less than that on the second day
40/(1-75%)=160
I read 25% more pages on the first day than on the second
40*(1+25%)=50
Li Hong read a story book, 40 pages on the first day, (), how many pages on the second day?
The second day saw 75% more than the first.
40×(1+75%)
The number of pages read on the second day was 75% of that on the first day.
40×75%
The number of pages viewed on the first day was 75% less than that on the second day.
40÷(1-75%)
I read 25% more pages on the first day than on the second.
40 × (1 + 25%)... Unfold
Li Hong read a story book, 40 pages on the first day, (), how many pages on the second day?
The second day saw 75% more than the first.
40×(1+75%)
The number of pages read on the second day was 75% of that on the first day.
40×75%
The number of pages viewed on the first day was 75% less than that on the second day.
40÷(1-75%)
I read 25% more pages on the first day than on the second.
40 × (1 + 25%) put away
1. The ratio of the number of apples in box a and Box B is 4:5. If 12 apples are taken from box a and put into Box B, the ratio of the number of chalk in box a and Box B is 7:5, how many apples are there in two boxes?
B: I'm sorry. There are two boxes of apples in the beginning
First of all, the problem is that the quantity ratio of a and B is 5:7
If Box B is x, then box a is 4 / 5 X,
Column equation
4/5x-12=5/7(x+12)
X = 240, then the number of boxes a = 192
Two cartons total 432
No, it's too much! After B minus before is more!
12÷（5/12-1/6)=48
If we consider from the aspect of a
12÷（5/6-7/12)=48
There is something wrong with this topic.
Suppose that the number of apples in box a and Box B is 4x and 5x respectively
Then: 4x-12 / 5x + 12 = 7 / 5
The solution is x =?
A: there are 9x apples in two boxes.
Is there something wrong with this topic Before a than B less than 12, but later than B more?!
If Box B is x, then box a is 4 / 5 X,
Column equation
4/5x-12=5/7(x+12)
X = 240, then the number of boxes a = 192
Two cartons total 432
If the total number is x, then the number of apples in B is 1 / 6x at the beginning and 5 / 12x later
It is known that there were 12 more apples later than at the beginning.
Then:
5/12x-1/6x=12
x=12/(5/12-1/6)=12/(3/12)=48
This is the correct answer.
If there are x apples in Box B, there are 5x apples in box a,
（5x-12）/(x+12)=7:5
X=8
There are 6x = 48 apples in two boxes
If Box B is x, then box a is 4 / 5 X,
Column equation
4/5x-12=5/7(x+12)
X = 240, then the number of boxes a = 192
Two cartons total 432
How many Pi is 60 PI multiplied by 120
60π×120
=60×120×π
=7200π
Xiao Ming read 15 pages of a story book on the first day and 28 pages on the second day. There are still 52 pages left. How many pages are there in this story book? (solved by equation)
Suppose this story book has x pages, & nbsp; x-15x-28 = 52 & nbsp; & nbsp; 45x-28 = 5245x-28 + 28 = 52 + 28 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 45x = 80 & nbsp; & nbsp; 45x △ 45x = 80 △ 45 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 100; answer: this story book has 100 pages
1. A rectangular column, the upper and lower bottom surfaces are connected with the ceiling and the ground, 50 cm in length, 40 cm in width, and 8 m in height. The upper and lower bottom do not need bricks, and they are pasted on all sides, 50 yuan per square meter of bricks. How many yuan do you need to paste the four sides?
2. Xiaoqiang has 87 stamps and Xiaohong has 48. After Xiaoqiang gives Xiaohong some stamps, Xiaohong's number of stamps is two-thirds of Xiaoqiang's. how many stamps did Xiaoqiang give Xiaohong?
1. 50 △ 100 × 8 × 2 + 40 △ 100 × 8 × 2 = 14.4 square meters
50 × 14.4 = 720 yuan
2. Xiaoqiang gave Xiaohong six stamps
87 × 2 / 3-48 = 10 sheets
10 ÷ (1 + 2 / 3) = 6 sheets
1, (0.5 * 8 + 0.4 * 8) * 2 * 50 = 720 yuan
2 is set to X.
87+x=（48-x）*2/3
Solution x = 33
I gave you 33
1.（0.5x8x2+0.4x8x2）x50=720
Xiaoqiang gave Xiaohong x stamps
（87-x）x 2/3=48+x
X=6
Six stamps for Xiaoqiang
(0.5X8+0.4X8)X2=
Set Xiaoqiang gave Xiaohong x stamps
(87-x)2/3=48+x
The result can be obtained by simple calculation
1. (0.5 × 8 × 2 + 0.4 × 8 × 2) × 50 = 720 yuan
2. Does she give Xiao Hong x stamps? 2 / 3 (87-x) = 48 + X: x = 6
1.40 * 8 * 2 = 640m ^ 2 50 * 40 * 2 = 400m ^ 2 (640 + 400) * 50 = 52000 yuan
First question:
Area of front and back surfaces: 0.5 × 8 × 2 = 8 (M2)
Area of left and right sides: 0.4 × 8 × 2 = 6.4 (M2)
Money used = (8 + 6.4) × 50 = 720 yuan
Second question
Let Xiaoqiang give Xiaohong x stamps and set up the equation
(87-x)2/3=48+x
The solution is x = 33
1.50cm=0.5m
40cm=0.4m
2 * 0.5 * 8 + 2 * 0.4 * 8 = 14.4 (M2)
14.4 * 50 = 720 yuan
2.（87-X）*2/3=48+X
X=6
How much is 120 times 4 / 12
It's better to list the formula
How to calculate? Don't just say the answer
120*4/12=40
Xiao Ming borrowed a 120 page story book and had read it for two days. The next day he read a quarter of the whole book, five more pages than the first day and five more than the first day
What page should the third day start from
On the second day, I read a quarter of the whole book, that is, 120 * 1 / 4 = 30 pages; on the second day, I read 5 more pages than on the first day, then I read 25 pages on the first day, that is, I have read 30 + 25 = 55 pages in two days. So on the third day, I should start from page 56!

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