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If the average (arithmetic mean) height of Bob, John and Tom

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by Max@Math Revolution » Wed Aug 01, 2018 11:26 pm

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[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.
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Source: — Data Sufficiency |
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by Max@Math Revolution » Sun Aug 05, 2018 5:51 pm
=>

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
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