GMAT Quantitative Reasoning Practice Test 7

Question : 52 of 100

Marks: +1, -0

What is the average number of questions that Laura can write in three days if on the first day she wrote 20 questions?
(1) Every passing day the number of questions that Laura writes grows by 20%.
(2) On the other two days, Laura wrote 53 questions.

Statement (1) BY ITSELF is sufficient to answer the question, but statement (2) by itself is not.
Statement (2) BY ITSELF is sufficient to answer the question, but statement (1) by itself is not.
Statements (1) and (2) TAKEN TOGETHER are sufficient to answer the question, even though NEITHER statement BY ITSELF is sufficient.
Either statement BY ITSELF is sufficient to answer the question.
Statements (1) and (2) TAKEN TOGETHER are NOT sufficient to answer the question, requiring more data pertaining to the problem.

Validate

Solution:

Laura writes questions over a 3 day period.
In the first day Laura wrote 20 questions.
Statement (1) tells us that on the second day she wrote 1.2 × 20 = 24 questions and on the third day she wrote

1.2 × 24

. This statement is sufficient in order to calculate the average.
Statement (2) is also sufficient, it gives us the sum of questions that Laura wrote in the other 2 days and therefore the average can be easily calculated. Each statement is sufficient on its own.

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