Answer: It is tripled.
Since x and y are proportional, whatever happens to x must happen to y in order for the two values to stay proportional.
Step-by-step explanation:
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Let a and b be store A and store B, respectively. Then:
3a+b=63
5a+4b=140
So
12a+4b=252
5a+4b=140
7a=112
a=16
b=15
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