Hamilton1757
Hamilton1757 Hamilton1757
  • 25-04-2018
  • Mathematics
contestada

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

Respuesta :

carlosego
carlosego carlosego
  • 06-05-2018
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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