andy has 23 coins worth 3.65 consisting of only quarters and dimes.how manydimes does he have?
2 answers
=3.42
q+ d = 23 or d = 23-q
25q + 10d = 365 or
5q + 2d = 73
sub in d = 23-q
5q + 2(23-q) = 73
5q + 46 - 2q = 73
3q = 27
q = 9
then d = 14
She has 14 dimes
check:
9(25) + 14(10) = 365 YEAH!
25q + 10d = 365 or
5q + 2d = 73
sub in d = 23-q
5q + 2(23-q) = 73
5q + 46 - 2q = 73
3q = 27
q = 9
then d = 14
She has 14 dimes
check:
9(25) + 14(10) = 365 YEAH!