GMAT Exam pack 2 - SC

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Would appreciate a little help on the following question:


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GMAT Exam pack 2 - CR

Hello BTG

Would appreciate som explanation to finding the right answer in the following question.

Thanks in advance.

In 1981 children in the United States spent an average of slightly less than two and a half hours a week doing household chores; by 1997 they had spent nearly six hours a week. A. chores; by 1997 they had spent nearly six hours a week B. chores; by 1997 that figure had grown to nearly six hours a w...

† and ¥ represent nonzero digits, and (†¥)² - (¥†)² is a perfect square. What is that perfect square? 121 361 576 961 1089 a² - b² = (a+b)(a-b). Thus: (†¥)² - (¥†)² = (†¥ + ¥†)(†¥ - ¥†). One approach is to TEST cases and look for a PATTERN. Case 1: †¥=21, ¥†=1...

Arithmetic - probability

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Would appreciate a little help on the question attached:


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Exponents-problem

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Would appreciate an approach to handle this problem:




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Lucas

This is actually one of my favorite problems in all of the OGs! There's a lot to learn about good PS process here. I would *NOT* recommend calculating here. I think it's unrealistic to think that someone without a solid quant background would execute that flawlessly in 2 minutes. You are definitely...

We need a "that" after convinced. Hi Optimus , Is it always required THAT after convinced? If no, then please explain when it it required? Also please explain why we do not need to use fact in this sentence? Please explain. Many thanks in advance Kavin Hi Kavin "the growing numbers&q...