There are 60 coins in a jar. Some are quarters and some are dimes. The total value is $12.30. How many of each coins is in the jar?

Answer 1

D+Q= 60

10D + 25Q = 1230

10D + 10Q = 600 Subtract to eliminate one variable

15Q =630

Q = 630/15 = 42 quarters

D=60-42 - 18 dimes

10(18) + 25(42) = 180 + 1050 = 1230