SOLUTION: 12 dimes and quarters have a value of $1.65 how many dimes are there

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Question 1065928: 12 dimes and quarters have a value of $1.65 how many dimes are there
Answer by ikleyn(53763) About Me  (Show Source):
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12 dimes and quarters have a value of $1.65 how many dimes are there
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25Q + 10*(12-Q) = 165,   where Q is the number of quarters.


15Q = 165 - 120  --->  15Q = 45  --->  Q = 45%2F15 = 3.

Answer. 3 quarters and 12-3 = 9 dimes.

For coin problems and their detailed solutions see the lessons in this site:
    - 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".