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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22-01-2015
Mathematics

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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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AL2006idn AL2006idn · Answer 1 · 2015-01-22T13:07:16-05:00

AL2006idn AL2006idn

22-01-2015

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 !

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