SOLUTION: A newspaper carrier has $7.10 in change. He has six more quarters than dimes but four times as many nickels as quarters. How many coins of each type does he have?

Question 1104603: A newspaper carrier has $7.10 in change. He has six more quarters than dimes but four times as many nickels as quarters. How many coins of each type does he have?
Answer by ikleyn(52878) (Show Source): You can put this solution on YOUR website!
.

5*N            + 10*D   + 25*Q      = 710    cents


5*(4*(x+6))    + 10*x   + 25*(x+6)  = 710


5*(4x + 24)    + 10*x   + 25x + 150 = 710


20x + 120      + 10x    + 25x + 150 = 710


55x + 270 = 710  ====>  55x = 710 - 270 = 440  ====>  x =  = 8.


Answer.  8 dimes,  8+6 = 14 quarters and  4*14 = 56  nickels.


Check.   5*56 + 8*10 + 14*25 = 710 cents.   ! Correct !

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There is entire bunch of lessons on coin problems
    - 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
    - Three methods for solving standard (typical) coin word problems
    - More complicated coin problems
    - Solving coin problems mentally by grouping without using equations
    - Santa Claus helps solving coin problem
    - OVERVIEW of lessons on coin word problems
in this site.

You will find there the lessons for all levels - from introductory to advanced,
and for all methods used - from one equation to two equations and even without equations.

Read them and become an expert in solution of coin problems.

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".

Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed.

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