Hybrid quant questions on the GMAT contain multiple steps with twists and turns. You must complete each step quickly to finish the problem in under two minutes. Don't underestimate how much time it takes to mull over how the different parts fit together and to transition from one line of thinking to another.
Try the following problem.
A student cuts 80 rectangles from construction paper, all of which are at least 10 inches in length and in width, and 20 percent of the rectangles that are greater than 10 inches long are exactly 10 inches wide. If 40 of the rectangles have a length of exactly 10 inches and 50 of the rectangles are greater than 10 inches wide, how many rectangles have a perimeter of greater than 40 inches? (Note: Assume that width and length are interchangeable; in other words, width does not have to be shorter than length.)
If you are able to figure out that any rectangles with one dimension greater than 10 inches would have to have a perimeter greater than 40, you would be able to eliminate three answer choices! The problem states that 40 rectangles have a length of exactly 10 inches, so the other 30 rectangles mist have a length greater than 10 inches. At least 40 rectangles, then, have a perimeter greater than 40 inches, so answers (A), (B) and (C) cannot be correct.
Which leaves (D) and (E). It is okay to guess here, if you cannot quickly figure the answer. You don't want to waste any time. A single wrong answer is not going to hurt your score! Don't get frustrated and just move on.
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