SOLUTION: Your piggy bank has a total of 40 coins in it. Some are dimes and some are nickles. If you have a total of $3.50, how many dimes do you have?

Question 322815: Your piggy bank has a total of 40 coins in it. Some are dimes and some are nickles. If you have a total of $3.50, how many dimes do you have?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = number of dimes
Let = number of nickels
given:
(1)
(2) (in cents)
Multiply both sides of (1) by and
subtract (1) from (2)
(2)
(1)

and

There are 30 dimes and 10 nickels
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