Three boxes have a total weight of 640 pounds. Box A weights twice as much as Box B. Box C weight 30 pounds more than Box A. How
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ANSWER
The correct answer is C .
<u>EXPLANATION</u>
We have
and
.
We solve the two equation simultaneously by elimination method. We need to be smart and eliminate y, since we are looking for .
We first multiply equation (2) by 2
.
We add equation (3) and (1).
.
Dividing through by 6 gives
.