Tim has a piggy bank that contains nickels and dimes worth $5.30. He has 75 coins in all. How many nickels and dimes does Tim have in his piggy bank?

Answer 1

N + D = 75

5N +10D = 530

5N + 10 ( 75 - N) = 530

5N + 750 - 10N = 530

-5N = -220

N = 44

44 nickels and 31 dimes

$2.20 + $3.10 = $5.30