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SAT I 一日一问：2012年12月6日

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The Correct answer is C.

Explanation

To evaluate the expression 3 times (y minus x) , it is necessary to determine the values of and. Since the sum of the measures of the angles of any triangle is 180 degrees, and a right angle has measure degrees, the value of can be found by solving the equation x + x + 90 = 180 . This yields x=45 . The value of > can be found by solving the equation y + y + y = 180 . This yields y=60 . Finally, the values for and 3 times (y minus x) to obtain 3 times (60 minus 45) = 3 times (15) = 45