vikrambansal wrote:Even I found adding much simple.
Brent - I'm reviewing wrong questions as per 60 day study guide. What do you say?
Both solutions are fast and easy.
It really comes down to number sense. If you feel confident in your number sense, then my earlier approach is fine. Otherwise, stick with making the calculations.
Here's an another example of what I mean:
Let's say you're working on a GMAT question that requires you to find a certain percent. After some work, you get to the point where you must
convert 11/49 into an approximate percent. What do you do from here?
Well, as always, we should check the answer choices before performing any calculations. If the answer choices are sufficiently spread apart, we can use some alternative techniques based on estimation and number sense.
Let's say that the 5 answer choices are as follows:
(A) 19.8%
(B) 21.6%
(C) 22.4%
(D) 39.4%
(E) 40.6%
Here's a fast approach that involves number sense:
We know that 11/50 = 22%
So, 11/49 will be a bit BIGGER than 22%.
So,
C must be the correct answer. Done!
If you feel confident in your number sense, then this kind of approach is quite fast.
If you don't feel confident, then you might need to perform a bit of long division and divide 11 by 49.
Once again, both approaches work.
Conclusion: play to your strengths
Cheers,
Brent
