What was Adrian’s average percentage in the last 2 tests?

1. His average for the last 3 tests is 80%.

2. He got 70% on his first test and 80% on his second test.

• A

• B

• C

• D

• E (correct answer)

Feedback: Statement (1) gives us insufficient data as it gives the average percentage for 3 tests. It also does not inform us about the total score for all the three tests or the exact score in any of the tests. Thus, the answers can be (B), (C), or (E). The next statement gives us only the percentage obtained in the first test, and not the second test. It is not simply a matter of averaging 70 and 80 as the two tests could have a different maximum score. Thus, both the statements are unable to solve the problem and the right answer is (E).

I am confused by this solution. Please guide me through why it is not (B). Thank you all.

## Averages?!

##### This topic has expert replies

- logitech
- Legendary Member
**Posts:**2134**Joined:**20 Oct 2008**Thanked**: 237 times**Followed by:**25 members**GMAT Score:**730

What a bad question.ellexay wrote:What was Adrian’s average percentage in the last 2 tests?

1. His average for the last 3 tests is 80%.

2. He got 70% on his first test and 80% on his second test.

• A

• B

• C

• D

• E (correct answer)

Feedback: Statement (1) gives us insufficient data as it gives the average percentage for 3 tests. It also does not inform us about the total score for all the three tests or the exact score in any of the tests. Thus, the answers can be (B), (C), or (E). The next statement gives us only the percentage obtained in the first test, and not the second test. It is not simply a matter of averaging 70 and 80 as the two tests could have a different maximum score. Thus, both the statements are unable to solve the problem and the right answer is (E).

I am confused by this solution. Please guide me through why it is not (B). Thank you all.

ellexay wrote:What was Adrian’s average percentage in the last 2 tests?

1. His average for the last 3 tests is 80%.

2. He got 70% on his first test and 80% on his second test.

So he might had 100 tests

and question is asking the 99th and 100th.

1) 98,99 and 100 - INSUF

2) Irrelevant 1, 2

Hence, E

LGTCH

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