I have some coins, and 15 of them are nickels. the ratio of nickels to dimes is 3 : 2, and the ratio of dimes to quarters is 5 : 4. how many quarters do i have
nickles=15=3 units
divide by 3
1 unit=5
2 units =dimes=52=10
dimes to quarters is 5:4
dimes=10=5 units
divide by 5
2=1 unit
quarters=4 units
24=8
8 quarters