Data Sufficiency - Quant/Math -

Question 4 the day: October 22, 2002
The question for the day is a data sufficiency question. One important thing about Data Sufficiency questions is that more often than not these questions take you about 30 seconds to crack them. And it generally does not involve any difficult calculations which tend to take most of the time when you solve a problem. Here the question is about whether you can solve the problem with the information given and NOT about actually solving the problem.

In this question, there is a question statement which is followed by two statements. You have to decide whether the information provided in the two statements is sufficient for answering the question.

Mark 1

If the question can be answered by using one of the statements alone, but cannot be answered by using the other statement alone.

Mark 2

If the question can be answered by using either statement alone.

Mark 3

If the question can be answered by using both statements together, but cannot be answered by using either statement alone.

Mark 4

If the question cannot be answered even by using both the statements together.

Question

A number is divisible by 33 if

1. the number is simultaneously divisible 3 and 11.
2. a number formed by reversing the positions of the digits of the same number is divisible by 33.

Solution:

Statement A. If a number is divisible by 33, it should be simultaneously divisible by 3 and 11.

Statement B. The property of any number divisible by 11 is that the palindrome of the number is also divisible by 11. The test of divisibility of 11 is that the difference between the sums of the alternate digits should be 0 or a multiple of 11. Therefore, Statement B also holds true.