Question

in a mixture of concrete, there are four lbs of cement mix for each pound of gravel. if the mixture contains a total of 130 lb of these two ingredients, how many pounds of gravel are there?

Answer 1

The proportion of gravel in the mixture is 1 / (4 + 1) = 1/5.

So in 130 lbs of mixture there is 1/5 * 130 = 26 lbs of gravel ( answer).