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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