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Aunt Li bought 15kg of special flour and 35kg of rice for 97.5 yuan. The price of 1kg of special flour is twice that of 1kg of rice. How much is the price of 1kg of special flour and rice?
Rice 1,5 yuan. Noodles 3 yuan
Aunt Zhang bought a bag of rice and a bag of flour, which cost 140 yuan. How much is the flour per kilogram? Rice 25 kg 3.4 yuan / kg flour 25 kg solve the equation
Because the price of flour plus the price of rice is 140 yuan, we can get the equation:
Suppose flour is x yuan per kilogram
25×3.4+25x=140
85+25x=140
25x=140-85
25x=55
x=2.2
A: flour is 2.2 yuan per kilogram
Calculation of factorization 3A & # 178; - 10A + 7
Please reply within 6.5 days, thank you
Replicator detour
=(3a-7)(a-1)
Xiaofang and Xiaohong use a 200 cm long ribbon to make Chinese knots. Xiaofang uses two fifths of the ribbon and Xiaohong uses three fifths of the ribbon. How many centimeters do Xiaofang and Xiaohong use each?
Xiaofang: 200 × two fifths = 80 (CM)
Xiaohong: 200 × three fifths = 120 (CM)
The square in the figure below is divided into four identical rectangles, each of which has a circumference of 40 cm?
Let the side length of a square be x (x + 14x) × 2 = 4054x × 2 = 4054x = 20x = 16, then the perimeter of a square is 16 × 4 = 64 (CM). Answer: the perimeter of a square is 64 cm
How many hectares are four-thirds of two fifths of a hectare
2/5×4/3=8/15
That is 8 / 15 hectares
Have a good time
Nanjing Yangtze River Bridge. The lower railway bridge is 6000 meters long, of which the main river bridge is 1500 meters long. It took two minutes for a 300 meter long train to pass through the main river bridge. What's the speed of the train, and how long does it take to walk a complete railway bridge at this speed
750 minutes, 2 -. 16 minutes
The length and width of a rectangle are 8cm and 5cm respectively. They rotate around its length and width to form two cylinders?
(1) The width is axis v = sh
=8*8*3.14*5
=1004.8 (cm3)
(2) The length is axis v = sh
=5*5*3.14*8
=628 (CC)
The propagation speed of light in vacuum is about 3 * 10 to the fifth power kilometers per second. The nearest star outside the solar system to the earth is Bilin. It takes about 4.22 years for its light to reach the earth. How far is the distance between Bilin and the earth calculated by 3 * 10 to the seventh power seconds per year?
Light year, the distance light travels in a year. So the 4.22 light year in the title is actually the 4.22 years light travels in the universe
t=4.22×365×24×3600s=133081920s
Because V = s / T
So s = VT = CT = 3 × 10 ^ 5km / s × 133081920s = 4.0 × 10 ^ 13km
Typing is not easy, if satisfied, hope to adopt
Beibei makes three times more paper cranes than Lili. When Lili makes another 40, Beibei makes two thirds more paper cranes than Lili. How many do Beibei make?
It's better not to be an equation. Why
In the whole process, the number of Beibei is the same, so the number of Beibei is used as unit 1
At first, Beibei is three times of Lili, then Lili is one third of Beibei
Later, Beibei was 2 / 3 more than Lili, so Beibei was 5 / 3 of Lili and Lili was 3 / 5 of Beibei
So you can see that three fifths of Beibei's is 40 more than one third of his
So Beibei does: 40 (3 / 5-1 / 3) = 150
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