Kevin and randy muise have a jar containing 68 ​coins, all of which are either quarters or nickels. the total value of the coins in the jar is ​$13.40. how many of each type of coin do they​ have?
For this case, the first thing we must do is define variables:  x: number of quarters  y: number of nickels  We now write the system of equations:  x + y = 68  0.25x + 0.05y = 13.40  Solving the system we have:  x = 50  y = 18  Answer:  they have:  quarters = 50  nickels = 18
