Student Academic Learning Services
Declaring Variables
Page 1 of 6
What is a Variable?
Declaring your variables
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This document last updated: 12/22/2010
Student Academic Learning Services
Page 2 of 6
Relating Variables Together
Systems of Equations
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Student Services Building (SSB), Room 204
905.721.2000 ext. 2491
This document last updated: 12/22/2010
Student Academic Learning Services
Page 3 of 6
Practice Problems
Try these problems before looking at the solutions given at the end of the document.
List of Math Words and their Definitions
Sum: Refers to adding up all of the numbers together to find a solution
Total: Refers to adding up all of the numbers together to find a solution
Times: Refers to multiplying numbers together
Twice: Refers to multiplying a number by two
Per: Refers to dividing numbers together
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Student Services Building (SSB), Room 204
905.721.2000 ext. 2491
This document last updated: 12/22/2010
Student Academic Learning Services
Page 4 of 6
Practice Problem Solutions
1. The sum of three consecutive integers is 45. What are they?
2. In a collection of nickels, dimes, and quarters, there are twice as many dimes as nickels and 3
fewer quarters than dimes. If the total value of the coins is $4.50, how many of each type of
coin are there?
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Student Services Building (SSB), Room 204
905.721.2000 ext. 2491
This document last updated: 12/22/2010
Student Academic Learning Services
Page 5 of 6
3. One number is 5 less than 4 times another. If the sum of the two numbers is 11, find the
numbers.
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Student Services Building (SSB), Room 204
905.721.2000 ext. 2491
This document last updated: 12/22/2010
Student Academic Learning Services
Page 6 of 6
4. Jack bought 34 stamps at the post office. Some were 37 cents, and the rest were 80 cents. If
the total cost of the stamps was $16.45, how many of each type did he buy?
5. A truck rental costs $45 per day plus $0.40 per mile. If a 2-day rental costs $170, how many
miles were driven?
www.durhamcollege.ca/sals
Student Services Building (SSB), Room 204
905.721.2000 ext. 2491
This document last updated: 12/22/2010