Find the number
Three-seventh of a number is 12.find the numberQuestion asked by: sanjsaga
Asked on: 03 Sep 2009
OK so the first step is to write this as a simple piece of algebra.
This is what that looks like:
3/7x = 12
OK so now we know that we just multiply by 7 and divide by 3 so find the number.
This gives up 12 = 7 = 84 / 3 = 28, so the answer is 28
By: knowitallRate Answer
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Comments and other answers:
We are looking to find z, where 3/7 of z = 12.
I am using the term z instead of the more common term x in order to avoid confusion between the x and the multiplication sign.
In order to take 3/7 of z, we simply multiply z by 3/7, which gives 3z/7.
So 3z/7 = 12.
=) 3z = 7 x 12 [multiplying both sides by 7]
=) 3z = 84
=) z = 84/3 [dividing both sides by 3]
=) z = 28
Date of comment: Fri, Dec 24th 2010
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