A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 6% cement should he mix with 3 bags of 12% cement to produce a mix containing 7% cement?
A) 23 bags
B) 17 bags
C) 18 bags
D) 15 bags

Question

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The Answer of A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 6% cement should he mix with 3 bags of 12% cement to produce a mix containing 7% cement?
A) 23 bags
B) 17 bags
C) 18 bags
D) 15 bags

A Contractor Mixes Concrete from Bags of Pre-Mix for Small