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Re: If T = 5/9 * (K - 32), and if T = 290, then K = [#permalink]
01 Sep 2014, 13:50

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If T = 5/9 * (K - 32), and if T = 290, then K = [#permalink]
14 Jul 2015, 03:14

jackrim1 wrote:

Can someone please explain the algebra that the previous poster used. How did they jump from the 1st equation to the 2nd?

Sure, look below:

Given: T = 5/9 * (K - 32) ----> Multiply both sides by 9/5, we get ----> 9/5T = (5/9 * 9/5) * (K-32)

----> 9/5 * T = 1 * (K-32) ----> (9/5 )T = K -32 (as x*1 = x) ----> Now add 32 to both sides (to transfer 32 from K-32 towards T), we get ----> (9/5)T + 32 = K

Now susbtitute T = 290 in the last equation, we get

Re: If T = 5/9 * (K - 32), and if T = 290, then K = [#permalink]
14 Jul 2015, 09:18

Just want to remind everyone to use estimation for problems such as this one. You will multiply 290 by something slightly less than 2 and then add 32. We know it is a whole number and greater than 500, only D is that... _________________

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Re: If T = 5/9 * (K - 32), and if T = 290, then K = [#permalink]
14 Jul 2015, 09:52

Honestly, it is something that you should be looking at most of the time. This is a thinking exam, not at math exam. _________________

Want to Ace the GMAT with 1 button? Start Here: GMAT Answers is an adaptive learning platform that will help you understand exactly what you need to do to get the score that you want.

Re: If T = 5/9 * (K - 32), and if T = 290, then K = [#permalink]
14 Jul 2015, 10:46

True, but if you do attempt to answer a question without doing math then there's a higher risk of getting muddled or making careless errors. There's obviously a balancing act and it'd be preferable to have some sort of guidelines to apply in choosing how to tackle a problem

gmatclubot

Re: If T = 5/9 * (K - 32), and if T = 290, then K =
[#permalink]
14 Jul 2015, 10:46

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