You are here:
- Home
- Science
- Math for Kids
- Word Problems
- systems of equations
Word Problems/systems of equations
Advertisement
Question
a collection of nickels and dimes is $3.30. there are 42 coins in all. how many of each kid of coin are there
If they were all dimes, that would be $4.20.
For each nickel added and dime subtracted, that makes it 5c less.
It needs to be 4.20 - 3.30 = 90c less.
This means that we need 90/5 = 18 nickels.
Given we have 18 nickels, we only have 42-18 = 24 dimes.
24 dimes are $2.40 and 18 nickels is 90c, so $2.40 + $0.90 = $3.30,
Related Articles
- How to Start a Coin Collection on Four Dollars - Jefferson Nickels - Coin Collecting - Starting a Coin Collection
- Buy & Sell Coins - Coin Values and Prices - Coin Catalogs and Red Book Values and How Much Your Coins are Worth
- Help your child learn math with these fun activities - What Are the Coins?
- Math with Money - Teach Math with Money Worksheets You Can Download and Print
- When a Bargain Is Not a Bargain - Personal Finance for Single Mothers
Word Problems
Answers by Expert:
Scott A Wilson
Expertise
Story problems with any relation to math.
Experience
I started doing story problems in grade school and have been helping people ever since.
Publications
In over 700 questions answered to other users. Maybe you're the next one ...
Education/Credentials
BA in Mathematical Sciences from OSU.
MS in Mathematics from OSU
Awards and Honors
Both my BS and MS degree were with honors.
Past/Present Clients
Students at OSU in the 80's and over 7000 questions right here,
but only around 1/10th of those have been word problems.
©2012 About.com, a part of The New York Times Company. All rights reserved.