Homework Help: algebra

Posted by dayalyn on Friday, January 4, 2013 at 4:15pm.

Tristan has $3.75 in quarters and dimes. She has 21 coins. How many of each coin does she have?

algebra - Reiny, Friday, January 4, 2013 at 5:47pm
quarters ---- x
dimes ------ 21-x

25x + 10(21-x) = 375
25x + 210 - 10x = 375
15x = 165
x = 11

Tristan has 11 quarters and 10 dimes

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