Question

A box of cereal states that there are 90 calories in 3/4 cup serving. How many calories are there in 4 cups of the cereal

Answer 1

480

Explanation:

Let x be the calories in 4 cups

Set it up

`(90)/((3)/(4))=(x)/(4)`

Step 1: Switch sides

`(x)/(4)=(90)/((3)/(4))`

Step 2: Apply fraction rule

`(x)/(4)=(90\cdot \:4)/(3)`

Multiply

`(x)/(4)=(360)/(3)`

Divide

`(x)/(4)=120`

Step 3: Multiply both sides by 4

`(4x)/(4)=120\cdot \:4\\\\=480`

There are 480 calories in 4 cups of the cereal.