nbayoungboy589
24.08.2021 •
Mathematics
Allen is reviewing his receipts from three different visits
to a spa, trying to determine the individual costs of his
favorite spa treatments. From his receipts he knows:
A manicure and a back rub together
cost $18.
A back rub and a facial together
cost $19.
A manicure and a facial together
cost $21.
What is the cost of a back rub?
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