A mixture of 50 kg of cement and gravel contains 10% of gravel. How many kg of gravel must be added to make the gravel content 28% in the new mixture?

A mixture of 50 kg of cement and gravel contains 10% of gravel. How ma

1.	A mixture of 50 kg of cement and gravel contains 10% of gravel. How many kg of gravel must be added to make the gravel content 28% in the new mixture?
A.	14.5
B.	10.5
C.	12.5
D.	17.5
Answer» D. 17.5

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A mixture of 50 kg of cement and gravel contains 10% of gravel. How many kg of gravel must be added to make the gravel content 28% in the new mixture?

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