[Math Revolution GMAT math practice question]
If the average (arithmetic mean) height of Bob, John and Tom is 180 cm, what is their median height?
1) Bob's height is 175cm.
2) John's height is 180cm.
If the average (arithmetic mean) height of Bob, John and Tom
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Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.
The first step of the VA (Variable Approach) method is to modify the original condition and the question. We then recheck the question.
When we have 3 numbers, if one of them is equal to their average, then it is also equal to their median.
Thus, condition 2) is sufficient.
Therefore, B is the answer.
Answer: B
Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.
The first step of the VA (Variable Approach) method is to modify the original condition and the question. We then recheck the question.
When we have 3 numbers, if one of them is equal to their average, then it is also equal to their median.
Thus, condition 2) is sufficient.
Therefore, B is the answer.
Answer: B
Math Revolution
The World's Most "Complete" GMAT Math Course!
Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]