# To make concrete it takes 8 parts crushed gravel, 7 parts water and 5 parts cement mix. a worker needs to make 220kg of concrete.

3 answers

###### Question:

To make concrete it takes 8 parts crushed gravel, 7 parts water and 5 parts cement mix. a worker needs to make 220kg of concrete. how much crushed gravel, water and cement mix is needed?

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## Answers

8+7+5=20

220/20=11

8 x 11=88

7 x 11=77

5 x 11=55

Ratio of crushed gravel to water to cement mix = 8:7:5 (for a total of 20 parts)

Thus . .

8/20 = fraction of crushed gravel

7/20 = fraction of water

5/20 = fraction of cement mix

If total is 200 kg, then . . .

(8/20)*(200 kg) = 80 kg crushed gravel

(7/20)*(200 kg) = 70 kg water

(5/20)*(200 kg) = 50 kg cement mix

A) 8 + 7 + 5 = 20 parts

b) 220 kg ÷ 20 = 11

c) 8 parts crushed gravel: 8 x 11 = 88 kg

7 parts water: 7 x 11 = 77 kg

5 parts cement: 5 x 11 = 55 kg

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