Rob has 40 coins, all dimes and quarters, worth $7.60. How many dimes and how many quarters does he have?

We have two equations where d is the number of dimes and q is the number of quarters:

  • d + q = 40
  • 0.1d + 0.25q = 7.60
    • Using our simultaneous equation calculator, we get:
    d = 16
    q = 24

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