Question 12865
Let number of nickels be "x".
Then number of dimes is 2x+3
Value of nickels is (5)x cents
Value of dimes is (10)(2x+3)= (20x+30) cents
Equation:
  Value of nickels + Value of dimes is 180 cents
         5x + 20x+30 = 180
              25x = 150
                x = 6 (number os nickels)
             2x+3 = 15(number of dimes)

Cheers,
Stan H.