5. Louis has 21 coins in his pouch, how many nickels and dimes does he have if he has $1.35?

1 answer:

3 0

N + d = 21
0.5n + 0.10d = 1.35
5n + 10d = 135
d = 21-n
5n + 210 - 10n = 135
-5n = -75
n = 15
d = 6

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