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Michael has a summer job as a bricklayer’s assistant. He is responsible for mixing the concrete. Concrete is made of cement, sand, and gravel in a ratio of 1:3:4 by mass. Michael needs to make 80 kg of concrete.

How much cement, sand, and gravel does Michael need to mix together to make 80 kg of concrete?

Sagot :

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Answer:

Step-by-step explanation:

80 / 12 = 6 2/3, so a twelfth of 80 is 6 2/3.

Cement:

6 2/3 * 1 = 6 2/3

Sand:

6 2/3 * 3 = 18 6/3 = 20

Gravel:

6 2/3 * 4 = 24 8/3 = 26 2/3

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