Problema Solution
a contractor mixes concrete from bags of pre-mix for small jobs. how many bags with 7
% cement should he mix with 4 bags of 17% cement to produce a mix containing 11% cement?
Answer provided by our tutors
Let 'x' represent the number of bags with 7% cement.
The total number of bags then is 'x + 4'.
0.07x + 0.17*4 = 0.11*(x + 4)
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click here to see the equation solved for x
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x = 6 bags
6 bags of 7% cement should be used for the mix.