Xiaohua weighs 35 kg. Xiaogang weighs 1 / 5 more than Xiaohua. What's Xiaogang's weight

Xiaohua weighs 35 kg. Xiaogang weighs 1 / 5 more than Xiaohua. What's Xiaogang's weight

35*(1+1/5)
=35*6/5
=42 (kg)
A: Xiaogang weighs 42 kg

It costs 1 / 3 of the total money to buy a pen and 4 yuan to buy a story book?

You should ask: the ratio of the money spent to the remaining money is 5:4. What is the remaining money?

I spent 1 / 3 of the money to buy a pen and 4 yuan to buy a story book. At this time, the proportion of the money spent belongs to the remaining thousand
Practical questions:
I spent 1 / 3 of the money to buy a pen and 4 yuan to buy a story book. At this time, the ratio of money spent to the remaining thousand is 5:4. Do you know how much money ha has left?
Fill in the blanks: 20 grams is 15 grams, 20 meters is 4 / 5 of, and 30 meters is 6 / 5 of
——：18=20：——=5:6=35：——
The number of a, B and C is 60, and the ratio is 2:3:5——
Ratio: 0.5 hectare: 150 square kilometers 2.5 square kilometers: 4 square meters

1. Let X be the original element
1/3x+4:2/3x-4=5:4
According to inward product equals outward product:
（1/3x+4）*5=（2/3x-4）*4
5/3x+20=8/3x-16
x=36
36 * 4 / 9 = 16 yuan
A: there are 16 yuan left
3 / 4 of 2.20g is 15g,
20 meters is 4 / 5 of 25 meters,
36 is 6 / 5 of 30,
15:18=20:24=35:42
60 / (2 + 3 + 5) = 6
6 * 2 = 12
0.5 ha: 150 km2 = 1:30000
2.5 square kilometers: 4 square meters = 625000:1
45 minutes: 1 / 20 = 15:1

It costs 1 / 3 of my money to buy a pen and 4 yuan to buy a story book. At this time, the ratio of the money spent to the rest is 5:4. Do you know how much money is left?

5+4=9
Total amount: 4 (5 / 9-1 / 3) = 18 yuan
Remaining: 18 × 4 / 9 = 8 yuan
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How to get denominator for solving linear equation with one variable
The best example

After the denominator is consistent, you can go

Children line up, 10 people in a row, the distance between two adjacent people is 2 meters, from the first child to the last child is how many meters?

From the first child to the last child
=2×（10-1）
=2×9
=18 meters

There are several integers whose absolute value is less than 6, and how many are they respectively

There are 11 integers with absolute value less than 6, which are - 5, - 4, - 3, - 2, - 1, 0, 1, 2, 3, 4, 5; integers with absolute value greater than 3 and less than 6 are - 5, - 4, 4, 5

Zhejiang's first volume of mathematics knowledge
. the more detailed the better.. good pursuit + points.. including the most important.. there are often test exercises, knowledge points, etc., class did not listen carefully.. decided to make up``

Geometric binary linear equation, ternary linear equation coordinates are very simple!
Class to listen to the teacher said one or two questions to understand!
I'll tell you one or two questions
If you don't talk about the geometric coordinates, the children will
Binary: {x + y = 2}
2X+Y＝4
Formula 2-1 = (2x + y) - (x + y) = x = 4-2 = 2
So x = 2
Substituting x = 2 into Formula 1
2+?＝2 Y＝0
It's a little more complicated!
Give me points!

There are 12 red, yellow, blue and white balls of the same size in the box. How many times should two pairs of balls of the same color be touched?
The teacher said 7 why? And the answer is the same

The first round: red, yellow, blue and white, 4 each
The second round: take another one, no matter what, there is a pair of the same color, such as 2 red;
If you take another color, there will be another pair of the same color; but if you take red, you need another one to appear
A pair, and there must be a pair of the same color
4+1+1+1=7

How many square feet is one square meter?

The answer upstairs is wrong. One foot is three and one third of a meter, not three meters
1 m = 3 feet, 1 Zhang = 10 feet, then:
1m = 0.3 Zhang
1 square meter is 0.3 *. 0.3 = 0.09 square foot