Question

When Jerry makes concrete he uses cement, sand and gravel in the ratio 1 : 2 : 4. For one job he used 15kg of sand.

a) How much cement and gravel did he use?
b) What is the total mass of the concrete he made?

Answer 1

a) 37.5

b) 52.5

Step by step explanation:

a). Cement : Sand : Gravel = 1 : 2 : 4

2x = 15kg

15/2 = 7.5

7.5 x 5 = 37.5

b). 37.5 + 15 = 52.5