To make concrete it take 8 parts crushed gravel, 7 parts water and 5 parts cement mix. A worker needs to make 220 kg of concrete. How much gravel, water and cement mix is needed.

Question

Quintin Cabrera

Mathematics

29 April, 19:47

To make concrete it take 8 parts crushed gravel, 7 parts water and 5 parts cement mix. A worker needs to make 220 kg of concrete. How much gravel, water and cement mix is needed.

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Answers (1)

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Vega · Answer 1

A complete load of concrete = 8 parts gravel + 7 parts water + 5 parts cement.

Total number of parts in every load = 8 + 7 + 5 = 20 parts

If total load = 220 kg, then 20 parts = 220 kg

Divide each side by 20 : 1 part = 11 kg

gravel = 8 parts = 8 x 11 kg = 88 kg

water = 7 parts = 7 x 11 kg = 77 kg

cement = 5 parts = 5 x 11 kg = 55 kg

Check: 88 + 77 + 55 = 220 yay!