Scott Woodbury-Stewart

GMAT OFFICIAL GUIDE PS – If Q is an odd number and the median of Q…

If Q is an odd number and the median of Q…

Solution:

We are given that Q is an ODD NUMBER and that the median of Q CONSECUTIVE INTEGERS is 120. Let’s choose a convenient number for Q, such as 3. We can now say:

The median of 3 consecutive integers is 120. Since 120 is the MEDIAN, or middle number of these integers, our 3 integers are the following:

119, 120, 121

The answer choices present us with formulas for the value of the largest integer in the sequence. To determine the correct formula, we therefore will plug 3 in for Q in each answer choice until we get 121.

A) (Q-1)/2 + 120

(3-1)/2 + 120 = 1 + 120 = 121.

This IS equal to 121.

B) 3q/2

(3 x 3)/2 = 9/2 = 4.5

This IS NOT equal to 121.

C) 150q

150 x 3 = 450

This IS NOT equal to 121.

D) q/100

3/100 = .03

This IS NOT equal to 121.

E) 150/q

150/3 = 50

This IS NOT equal to 121.

The only answer that is equal to 121.

Answer: A