Question 11267
Let number of nickels be "x".
Then number of pennies is "x+7"
And number of quarters is "x+7-2" = "x+5"
Value of nickels is (5)x cents
Value of pennies is (1)(x+7)= x+7 cents
Value of quarters is (25)(x+5)= 25x+125 cents
EQUATION:
  Value of nickels + Value of pennies + Value of quarters = 287 cents
        5x + x+7 + 25x+125 = 287
              31x = 155
                x = 5 (number of nickels)
             x+7 = 12 (number of pennies)
             x+5 = 10 (number of quarters)