Question 23414
Let number of dimes be "2x"
Then number of quarters is "x"
Value of dimes is (10)2x=20x cents
Value of quarters is (25)x = 25x cents
EQUATION:
 Value of dimes + Value of quarters = 2250 cents
       20x + 25x = 2250
             45x = 2250
               x = 50 (number of quarters)
              2x = 100 (number of dimes)

Cheers,
Stan H.