Answer:
John is 19 and his sister is 23.
Step-by-step explanation:
See attached image.
Answer:
2 or 6
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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Answer: y=32/5
Step-by-step explanation: