Math unit rates

Question

Caleb bought 6 packs of pencils for $12.how much will he pay for 9 packs of pencils?

Answer 1

The unit rate is the cost of one item. For these pencils, $12 for 6 packs has a unit rate of $2 for 1 pack.

Using this unit rate, we can multiply by p to determine the cost of 9 packs:

$2 * 9 = $18 for 9 packs