Question

Kenneth has a total of 18 coins consisting of nickels and quarters. The total value of the coins is $2.50 . How many of each type of coin does he have?

Answer 1

I am French I found the values ​​$0.05 and $0.25 on the net

1 nickel=5 cent =$0,05

1 quarter =25cents=$0,25

x= nickels

y = quarter

x+y =18

0,05x+0,25y=2.5

per substitution ; y =18-x

0,05x+0,25(18-x)= 2.5

0.05x+4,5-0,25x=2.5

0,2x=2.5-4.5

x=2/0,.2 =10

we calculate number of quarters

x+y=18

10+y=18

y=18-10=8

Kenneth has 8 quarters and 10 nickels.