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This question originally appeared on PrepForTests.com, where it includes a full explanation.

Sounds like you are looking for practice questions to me, so here are our GMAT practice questions. Link removed by Erin. Joel

As givemeanid says you were just missing the '4 more' from the original question when you translated it into equations. If you want more help with translating word problems into equations see this word problems tutorial. Best of luck, Joel

There's nothing you can do if both the bases and the exponents are different. See our exponents tutorial for more information on products of exponents. Best of luck, Joel

Congratulations, what a great score. Thanks for sharing this, I've added it to our list of recommended GMAT debriefs. Best of luck with your apps. Joel

The practice questions form the OG are the best, if you finish those then these 10 critical reasoning practice questions should help.

5 key strategies for tackling critical reasoning questions in the GMAT.

Perhaps a simpler way to look at why both statements together are sufficient is to add both equations together You know X - 3Y > 0 and 4Y - X > 0 so (X - 3Y) + (4Y - X) > 0 + 0 Simplifying both sides gives you Y > 0 If Y > 0 and X - 3Y > 0 then X > 0 Since X and Y are both greater than 0, then X + Y > 0, so both statements together are sufficient. See this data sufficiency tutorial for more help solving these types of questions.

The total number of tickets was 7,000 but 80 remain unsold so the total number sold was 6,920. The tickets were sold at an average price of $10. The total value of tickets sold was 6,920 x $10 = $69,200 so the answer is B. For more help with this type of question see this GMAT word problems tutorial.

That's a very impressive score, particularly in view of how much prep you did. I hope you don't mind but I add this to the day I took the GMAT. Well done and best of luck with your application(s).

Congratulations on a super fine score. Thanks for sharing your top tips, I hope you don't mind but I have added your account to tips from successful GMAT takers. Best of luck with your applications!

Or if you just want hints. 1. A speed/distance/time tutorial 2. A simpler average speed question to get you started

Lets say n is the square root of 2 which is not an integer. If so then n^2 = 2 (which is an integer). So the fact that n^2 is an integer does NOT guarantee that n is an integer.

I've just published our new data sufficiency tutorial and a corresponding set of practice questions. Give them a go and tell me what you think. Joel

Do you have a particular GMAT question in mind when you asked this question? Instructions for calculating lengths of arcs and areas of sectors can be found in this GMAT geometry tutorial and you can check that you understand how to do it with this practice question on sectors.

Inequalities are always tough in data sufficiency questions. I assume that it is fairly clearly why neither statement on it's own is sufficient which leaves us to work out whether the answer should be C (Together) or E (Neither). One way to do this is algabraicaly. If you add both inequalities together you get (m - 3z) + (4z -m) > 0 + 0 So z > 0 And if z>0 then m - 3z > 0 implies that m > 0. Since we know m>0 and z>0 then m + z > 0 and with both statements together we can solve the problem. The answer is C.

I agree with modusoperandi's selection of B as the answer, my reasons are outlined below. The premises are 1. Blackbirds nesting for the first time are less successful at breeding than older birds. 2. Older birds are not any bigger or stronger than birds nesting for the first time. Conclusion Blackbirds learn to build better nests and so improve their breeding success. Process of elimination A. Irrelevant, the conclusion and premises are all just about blackbirds. Eliminate. B. This provides another reason why blackbirds might be less successful the first time they nest i.e. because the quality of the eggs they produce is not as good as it will be in successive years. This weakens the argument that they must have learned to build better nests. C. Repeat of first premise. Eliminate. D. Irrelevant, the second premise means that the argument does not rest on the size of the birds. E. Irrelevant. All the answers except B can be eliminated because they are not relevant and B appears to seriously weaken the argument. So B is correct. See this GMAT critical reasoning tutorial for tips on approaching these questions. Best of luck!

This line is in there because the test is taken on a computer, which means that the lines are all rendered as pixels on a screen and which in some cases (particularly when a line is nearly vertical or nearly horizontal) will make it look slightly jagged. Likely as not you won't even notice. Best of luck.

This question can be made to seem much easier solve it using substitution. The question tells us that n is a multiple of d, so try setting d to be 2 then n to be 10 and then answering the question. Say if you get stuck and I'll post a full explanation.

Surya's right keep calm. Read some of these tips from successful GMAT takers which will inspire you in your study. Best of luck.

See Og 181 for further discussion of this problem.

Statement 1 is insufficient. If 2 is a prime factor of n then the statement tells you that n will have 4 different prime factors, if 2 is not a prime factor of n then the statement tells you that n will have 3 different prime factors (try with n = 105 if you are not convinced). Statement 2 is sufficient. n^2 has 4 different prime factors then n must have 4 different prime factors (e.g. n = 2 x 3 x 5 x 7, then n^2 = 2^2 x 3^2 x 5^2 x 7^2). Therefore B is the correct answer

Here's a similar question for you to try.

You need both the lengths of the sides AND the angles to work out the ratio between the two diagonals of a parallelogram so the answer is C.

Look at how the sentence changes Between vs. among When comparing two things i.e. stocks and bonds you should use 'between' rather than 'among' (see comparison problems for more details). This eliminates B and D. Compare with vs. compare to When emphasising the differences use the idiom 'compare with' rather than 'compare to' (see this list of common idiomatic expressions for more details). This eliminates A. Comparisons vs. comparing The preposition on should be followed by a noun so 'comparisons' fits in just right. This eliminates E. Therefore C is the right answer.