A music teacher sells piano lesson packages.Piano Lesson PackagesTotal Cost Number of Lessons $9010$16020$8010$12020Which package has the lowest ratio of cost to number of lessons?

Divide each package’s cost by its number of lessons to find the cost per lesson: $90 ÷ 10 = $9, $160 ÷ 20 = $8, $80 ÷ 10 = $8, and $120 ÷ 20 = $6. The lowest cost per lesson is $6, so the $120 package for 20 lessons has the lowest ratio.

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