Need now jina wants to plant grass in her backyard. her backyard is in the shape of a rectangle. its length is
31
feet and its width is
24
feet. suppose each pack of seed covers
12
square feet. how many packs of seed will she need to cover the backyard?

The area of the backyard=31×24
=744
the required packs of seed=744÷12
=62
So she will need 62 packs of seed to cover the backyard.

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.