Tatyana has a bag of coins. The bag contains 7 nickels, 3 dimes, and 5 quarters.

Question

Need help I don’t understand

Answer 1

N+D+Q = 7+3+5 = 15 total coins

5(7) + 10(3) + 25(5) = 35+30+125 = 190 = $1.90 total value of the coins

N+D+Q = 15

4N+10D + 25Q = 190

35 cents in nickels plus 30 cents in dimes plus $1.25 in quarters = $1.90 total value