A local Best Buy sells 8 times as many iPods as Sears. The difference between their sales is 490 iPods. How many iPods did each sell?

Explanation:

You may set a system of equations.

1. Name the variables:

2. Translate every verbal statement into a mathematical expression

a) A local Best Buy sells 8 times as many iPods as Sears.

b)  The difference between their sales is 490 iPods.

3. Solve the system of equations

a) Substitute B = 8S into the second equation

b) Add like terms

c) Divide both sides by 7

d) Substitue S = 70 into B = 8S

Solution:

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