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The telephone connection for a home computer costs \(\$1.25\) for every 3 minutes it is in use. How much does it cost for 21 minutes?

Explanation

Set up a proportion and solve for the missing term.
\(\frac {\text { minutes }}{\text { cost }}=\frac{3}{1.25}=\frac{21}{ x}\)
\(3 x=1.25 \times 21\)
3x = 26.25
x = 8.75
So, 21 minutes will cost \(\$8.75\).

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