One kind of concrete is made of cement, sand and stone according to the standard of 2:3:5. Now there are 18 tons of cement, how many tons of sand and stone are needed?
The weight of each part: 18 △ 2 = 9 (tons); sand: 9 × 3 = 27 (tons); stone: 9 × 5 = 45 (tons). Answer: 27 tons of sand and 45 tons of stone are needed
One kind of concrete is made of cement, sand and stone according to the standard of 2:3:5. Now there are 18 tons of cement, how many tons of sand and stone are needed?
The weight of each part: 18 △ 2 = 9 (tons); sand: 9 × 3 = 27 (tons); stone: 9 × 5 = 45 (tons). Answer: 27 tons of sand and 45 tons of stone are needed
A kind of concrete is made of cement, sand and stone in the ratio of 2:3:5. How many tons of cement are needed to prepare 1920 tons of this kind of concrete?
2 + 3 + 5 = 10 (parts), 1920 × 210 = 384 (tons); answer: need 384 tons of cement
Concrete is made up of 3 parts of sand, 2 parts of stone and 1 part of cement. 2 tons of cement can mix () tons of concrete
Concrete is made up of 3 parts of sand, 2 parts of stone and 1 part of cement. 2 tons of cement can mix (12) tons of concrete