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OpenStudy (anonymous):
Your piggy bank has a total of 46 coins in it; some are dimes and some are quarters. If you have a total of $7.00, how many quarters and how many dimes do you have?
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OpenStudy (pfenn1):
Let d = number of dimes and q = number of quarters. We know we have 46 coins so\[d+q=46\]
OpenStudy (pfenn1):
The sum of the number of coins times their respective worth totals $7.00 so 0.10d+0.25q=7.00
OpenStudy (pfenn1):
Solve the first equation for d (or q) and substitute into second equation.
OpenStudy (anonymous):
Thank you..! :) im going to work it out now.
OpenStudy (pfenn1):
You're welcome.
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