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OpenStudy (anonymous):
a cash register contains 18 quarters and dimes, find the total of the coins in the terms of quarters, q
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OpenStudy (sandra):
ok, so they're asking you for an equation that represent the relationship between quarters and dimes
OpenStudy (sandra):
so if there are 18 total coins, then we know that #quarters + #dimes = 18
OpenStudy (sandra):
so if d+q=18, then d+q-d = 18-d, and q=18-d
OpenStudy (sandra):
that is, the number of quarters must be 18 minus however many dimes there are, since you know there are 18 coins and only those two types
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