Translate the problem to a system of equations; then solve using the elimination method.A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 3% cement should he mix with 4 bags of 22.5% cement to produce a mix containing 9% cement?
A. 9 bags
B. 11 bags
C. 13 bags
D. 18 bags
Answer: A
Mathematics
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.
?
A. 
B. 
C. 
D. 
E. 
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