Question

Your piggy bank has a total of 41 coins in it; some are dimes and some are nickels. If you have a total of $3.45, how many nickels do you have?

Numerical Answers Expected!

Answer 1

x = # of dimes
y = # of nickels

x + y = 41 <---------there are a total of 41 coins
0.10x + 0.05y = 3.45 <-------------there is a total of 3.45

Solve for x and y

x = 41 - y
0.10(41 - y) + 0.05y = 3.45
4.1 - 0.10y + 0.05y = 3.45
-0.05y = -0.65
y = 13

x + 13 = 41
x = 28

ANSWER:
28 dimes and 13 nickels