Question

Question #d76c4

Answer 1

`x=13 1/3 or 13.333...`

Explanation:

In order to solve this, we set up a proportion. When we see 90%, we can automatically know that it also could be written as `90/100`.

Since we want to know what 12 is 90% of, we can write a proportion that says "12 is 90% of `x` as 90 is 90% of 100." That proportion looks like the following:

`12/x=90/100`

Cross multiply.

`90 * x = 90x`
`12 * 100 = 1200`

Your equation now looks like `90x=1200`. Balance this by dividing both sides by 90, and you will have your answer.

`"90x"/90=1200/90`
`x=13 1/3 or 13.333...`