MY NOTES
ASK YOUR TEACHER
Vina has $4.20 in quarters, dimes and nickels in her purse. She has seven more dimes than quarters and six more nickels than quarters. How many of each coin are in her purse?
nickels
dimes
quarters
write what you know:
5n+10d+25q = 420
d = q+7
n = q+6
Now solve as usual.
number of quarters --- x
number of dimes = x+7
number of nickels = x+6
25x + 10(x+7) + 5(x+6) = 420
solve for x to get the number of quarters and take it from there.