The ratio of cement, sand and stone is 2:3:5. How many tons of cement, sand and stone are needed to mix 20 tons of such concrete?

The ratio of cement, sand and stone is 2:3:5. How many tons of cement, sand and stone are needed to mix 20 tons of such concrete?

Cement: 20 × 22 + 3 + 5 = 4 (tons), sand: 20 × 32 + 3 + 5 = 6 (tons), stone: 20 × 52 + 3 + 5 = 10 (tons). Answer: need 4 tons of cement, 6 tons of sand, 10 tons of stone

In a kind of concrete, the ratio of cement, sand and stone is 2:3:5. There are 20 tons of stones. How many tons of cement and sand are needed?

The ratio of cement, sand and stone is 2:3:5
2+3+5=10
Then the concrete is 20 / (5 / 10) = 40 tons
Then sand 40 * (3 / 10) = 12 tons
Cement 40 * (2 / 10) = 8 tons

Construction workers use 2 parts of cement, 3 parts of sand and 5 parts of stone to make concrete. To make 6000 kg of this kind of concrete, how many kg of cement, sand and stone are needed?

2 + 3 + 5 = 10 (parts), cement: 6000 × 210 = 1200 (kg), sand: 6000 × 310 = 1800 (kg), stone: 6000 × 510 = 3000 (kg); answer: cement: 1200 kg, sand: 1800 kg, stone: 3000 kg