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17 August, 12:14

Chang has 36 coins, all dimes and half-dollars. The total value of all these coins is $12.00. How many dimes does he have?

6

21

15

18

+3
Answers (1)
  1. 17 August, 16:13
    0
    The first thing we must do for this case is to define variables.

    We have then:

    x = number of dimes

    y = number of half-dollars

    We write the system of equations:

    x + y = 36

    0.10x + 0.50y = 12

    Solving the system we have:

    x = 15

    y = 21

    Answer:

    He has 15 dimes
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