You have 23 coins, including nickels, dimes, and quarters. if you have two more dimes than quarters, and the total value of the coins is $2.50. how many of each kind of coin do you have?
Accepted Solution
A:
You can write three equations in the numbers of nickels (n), dime (d), and quarters (q). n + d + q = 23 . . . . . . . there are 23 coins total 0n +d -q = 2 . . . . . . . . .there are 2 more dimes than quarters 5n +10d +25q = 250 . .the total value is $2.50
The collection includes 11 nickels, 7 dimes, and 5 quarters.
_____ I used the matrix function of my calculator to solve these equations. You can find q by subtracting from the last equation five times the sum of the first two equations. (5n +10d +25q) -5((n +d +q) +(d -q)) = (250) -5(23 +2) 25q = 125 . . . . . . . simplify q = 5 From the second equation, d = q +2 = 7 And from the first, n = 23 -5 -7 = 11