Answer:
50 dimes 90 quarters
Step-by-step explanation:
this problem needs 2 equations
1. D+Q = 140 ( shows the total amount of coins )
2. 0.1D+0.25Q = 27.50 ( shows the total cost )
the best way to do this is by subtraction
to get D by itself, the first equation would turn into D = 140 - Q
plug 140-Q into the second equation where you see D and solve for Q
once you solve it you should get Q = 90 then to get D it would be 140 - 90 which gives you D = 50.
