the total value of the dimes and quarters in a coin bank is $3.70. if the quarters were dimes and the dimes were quarters, the total value would be $4. Find the number of dimes and the number of quarters in the bank.

Answer 1

Wouldn't you do that in similar fashion?
x = #dimes
y = #quarters
value equations.
10x + 25y = 370
25x + 10y = 400
Solve for x and y. Solve by simultaneous equations. Show your work if you get stuck.