A kind of concrete, the ratio of cement, sand and stone is 2:3:5, in which 3 tons of cement is used. How many tons of sand and stone are used respectively It's a formula

A kind of concrete, the ratio of cement, sand and stone is 2:3:5, in which 3 tons of cement is used. How many tons of sand and stone are used respectively It's a formula

Sand = 3 △ 2 × 3 = 4.5 tons
Stone = 3 △ 2 × 5 = 7.5 tons