SOLUTION: An office keeps a cashbox with $5 and $10 bills for small purchases. The cashbox has 25 bills in all. The total amount of money in the cashbox is $165. How many $5 bills are in the

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Question 1080787: An office keeps a cashbox with $5 and $10 bills for small purchases. The cashbox has 25 bills in all. The total amount of money in the cashbox is $165. How many $5 bills are in the box?
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.
17 $5-bills and 8 $10-bills.


I solved it MENTALLY.


If you want to learn on how to solve such problems mentally, read the lesson
    - Solving coin problems without using equations
in this site.


Also, there is a bunch of coin problems with detailed solutions in this site.
See the lessons
    - Coin problems
    - More Coin problems
    - Solving coin problems without using equations
    - Kevin and Randy Muise have a jar containing coins
    - Typical coin problems from the archive
    - Solving coin problems mentally by grouping without using equations
    - Santa Claus helps solving coin problem

Read them attentively and become an expert in this field.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Coin problems".