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4 January, 10:48

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?

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  1. 4 January, 11:06
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    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).
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