Question

Bob the builder is making 540 kg of concrete mix.

Concrete is made by mixing cement, sand and gravel in the ratio 1:3:5
How much gravel does he need?

Answer 1

300 kg

Explanation:

Let Constant Ratio be x:

x+3x+5x = 540

9x = 540

x = 60 kg

So, weight of gravel (W) = 5x

5 x 60

W = 300 kg (ANS)