A job opening was posted in September and again in January.

Question

A job opening was posted in September and again in January. In September, the number of applicants for the position was 60. What was the percent change in the number of applicants from September to January?

(1) The number of applicants in January was one-third the number of applicants in September
(2) The number of applicants in January was 20

This is a  Data Sufficiency Butler Question

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Kevi · Answer

A job opening was posted in September and again in January. In September, the number of applicants for the position was 60. What was the percent change in the number of applicants from September to January?
(Jan-Sep)/Sep *100 =?

(1) The number of applicants in January was one-third the number of applicants in September.
J=(1/3)S 
=(1/3)60-60/60 *100
=20-60/60 *100
= -40/60 *100
=66.67% decrease 
Sufficient

(2) The number of applicants in January was 20
20-60/60 *100 
= -66.67% 
Sufficient

D

SS990 · Answer

Given: Sept no. Of applcnts: 60

To find: % change from Sept to Jan

1) Jan = 0.33*s so this is sufficient to know % change

2) Jan no. Of applcnts =20
This is also sufficient

Hence answer is D

MaTaM · Answer

This one you can answer really really fast!
Remember:  you don't need to actually solve the question , you just need to determine what piece(s) of information are needed.

Here what we are asked is the percent change of applicants from September (s) to January (j):

x = (s-j)/s * 100

We are given s=60, so  we just need j

(1) j = 1/3 * s = 20 
(2) j = 20

Both (1) and (2) give us enough information on their own  to be able to solve the problem!
 
A: Statement (1) alone is sufficient.    B : Statement (2) alone is sufficient.   
   C : Both statements together are sufficient, but neither alone is.   
    D : Each statement alone is sufficient.    
   E : Neither statement is sufficient, even together.

A job opening was posted in September and again in January.

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GMAT Data Sufficiency (DS) Questions

­A job opening was posted in September and again in January.

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A job opening was posted in September and again in January.