7.RP.A.2.c

Represent proportional relationships by equations. For example, if total cost t is proportional to the number n of items purchased at a constant price p, the relationship between the total cost and the number of items can be expressed as t = pn.

Example Problems
A car travels 540 miles in 9 hours.

How many miles does the car travel per hour?
There are 320 ounces in 20 pounds.
How many
ounces per pound are there?
There are 128 ounces in a gallon. There are 4 quarts in a gallon.

How many ounces are in a quart?
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