GMAT真题5

13 Math Section ------------------------------------------------------------------------------------------------------------ Q1: ELECTRICITY USAGE IN A CERTAIN HOUSEHOLD ON MAY 1 Appliance Number of Hours in Use Number of Watts of Electricity Used per Hour TV 4 145 Computer 3 155 VCR 2 45 Stereo 2 109 According to the table above, what was the total number of watts of electricity used for the four appliances in the household on May 1? A. 454 B. 860 C. 1,100 D. 1,230 E. 1,353 Answer: ------------------------------------------------------------------------------------------------------------ Q2: What is the ratio of the average (arithmetic mean) height of students in class X to the average height of students in class Y? (1) The average height of the students in class X is 120 centimeters. (2) The average height of the students in class X and class Y combined is 126 centimeters. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient. Answer: ------------------------------------------------------------------------------------------------------------ Q3: If a committee of 3 people is to be selected from among 5 married couples so that the committee does not include two people who are married to each other, how many such committees are possible? 14 A. 20 B. 40 C. 50 D. 80 E. 120 Answer: ------------------------------------------------------------------------------------------------------------ Q4: √[2√63 + 2/(8+3√7)] = A. 8 + 3√7 B. 4 + 3...