d + n = 25
10d + 5n = 185
Solve the 1st for n or d. Let's do d.
d = 25 - n
Substitute!
10(25 - n) + 5n = 185
250 - 10n + 5n = 185
5n = 65
n = 13
d = 25 - 13
d = 12
Angelaa O.
asked 04/25/18
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