Kevin and Randy Muise have a jar containing 96 ​coins, all of which are either quarters or nickels. The total value of the coins in the jar is ​$14.20 . How many of each type of coin do they​ have?

Respuesta :

Answer:

The number of quarters is 47 and the number of nickels is 49.

Explanation:

Let the number of quarters be x and the number of nickels be y.

Kevin and Randy Muise have a jar containing 96 ​coins, all of which are either quarters or nickels.

[tex]x+y=96[/tex]          .... (1)

1 quarters = 0.25 dollars

1 nickels = 0.05 dollars

The total value of the coins in the jar is ​$14.20.

[tex]0.25x+0.05y=14.20[/tex]       .... (2)

From (1) and (2), we get

[tex]0.25(96-y)+0.05y=14.20[/tex]

[tex]2400-25y+5y=1420[/tex]

[tex]-20y=-980[/tex]

[tex]y=49[/tex]

Put this value in equation (1).

[tex]x+49=96[/tex]

[tex]x=96-49[/tex]

[tex]x=47[/tex]

The value of x is 47 and the value of y is 49. Therefore the number of quarters is 47 and the number of nickels is 49.