# The average rate of hair growth is 2.5 centimeters every 2 months. At that rate, how many months will it take to grow 22.5 centimeters of hair????

##### 1 Answer

Mar 8, 2018

It would take 18 months to grow out 22.5 cm of hair. See Explanation.

#### Explanation:

The easiest way to solve this question is by using a proportion.

2.5 cm of hair growth is to 2 months as 22.5 cm of hair growth is to x months.

So, basically what you do is set the proportions and cross multiply...

If you multiply it out, it should become...

Now, divide both sides by

and that should give you...

Therefore, it takes 18 months to grow out 22.5 cm of hair.

Hope this helps!