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????

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Answer 1 · 2018-03-08T02:58:43

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

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

#2.5(x)=22.5(2)#

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

#2.5x=45#

Now, divide both sides by #2.5# in order to isolate the #x#...
and that should give you...

#x=18#

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

Hope this helps!