SOLUTION: a pile of 40 coins consists of nickels and dimes. The total value of the coins is $2.40. find the number of each type of coin.

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Question 1075087: a pile of 40 coins consists of nickels and dimes. The total value of the coins is $2.40. find the number of each type of coin.
Answer by ikleyn(52790) About Me  (Show Source):
You can put this solution on YOUR website!
.
10*D + 5*(40-D) = 240 cents. (D = number of dimes).

Simplify

10D + 200 - 5D = 240,
5D = 240-200 = 40 ---> D = 40%2F5 = 8

Answer. 8 dimes and 40-8 = 32 nickels.


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
    - More complicated coin problems
    - Solving coin problems mentally by grouping without using equations
    - Santa Claus helps solving coin problem
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".