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Thanks for the response Bb. Appreciate your input. It sounds like timing is the best way to close the gap between real GMAT and practice CAT's, since you ultimately need more time for probelms that are tough and unfamiliar.

My strategy for getting stumped -- the questions that confuse me are the ones I waste the most time on, and those throw off my entire section. So, If I get stumped and realize after 1 minute that I won't figure the question out, my plan B is to simply stop trying to solve it. Instead, use the next 15-45 seconds to come up with the best guess I can come up with, then simply move on. I find that the 1 minute mark is the point where you know whether you'll get the answer or not. I suppose using this strategy (and practicing to make sure I can implement it) is a good way to help me move past questions that will stump me
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Water lily grows at such a rate that it covers double the surface that it covered the day before. It takes 30 days for a water lily to cover the entire surface of the pond. How long would it take for two water lilies of the same size to cover the entire surface of the same pond?
A. 8.33
B. 12.5
C. 15
D. 20
E. 29

Let me take a stab at this algebraically.

Let x = the size of the water lily on day 1.

x * 2^30 is the size of the pond.

The question is asking us what the exponent of 2 is when we start with 2x.

Let y = the value we're trying to find:

x * 2^30 = 2x * 2^y

x * 2^30 = x * 2^y+1

Cancel out the x's and we're left with exponents of the same base:

2^30 = 2^y+1

30 = y+1

y = 29

Answer (E)
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