XAT / #XAT 2018

September 02, 2017 @ 12:48 PM

September 02, 2017 @ 12:48 PM

K. J. Somaiya Institute of Management Studies and Research, Mumbai

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XAT 2013: Quant Questions (LCM, Number Properties)

MBA aspirants who are taking XAT on forthcoming January 6, 2013 may find following Quant question useful for practice: 

Three Vice Presidents (VP) of a company regularly visit the plant on different days. Due to labor unrest, VP (HR) regularly visits the plant after a gap of 2 days. VP (Operations) regularly visits the plant after a gap of 3 days. VP (sales) regularly visits the plant after a gap of 5 days. The VPs do not deviate from their individual schedules. CEO of the company meets the VPs when all the three VPs come to the plant together. CEO is on leave from January 5th to January 28th, 2012. Last time CEO met the VPs on January 3, 2012. When is the next time CEO will meet all the VPs?
 
A.February 6, 2012
B.February 8, 2012
D.February 9, 2012
E.None of the above
 
Answer :  Option C [February 8, 2012.]
 
Explanation
 
VP (HR) visits the plant every 3rd day 
 
•NOTE: After a gap of 2 days. Carefully observe that the question states that the VP visited after a gap of 2 days not every 2 days.
•If VP (HR) visited the plant on day 0, he will visit again on day 3, day 6 and so on.
•i.e., on days those are multiples of 3.
VP (Operations) visits the plant every 4th day (after a gap of 3 days).
•If VP (Operations) visited the plant on day 0, he will visit again on day 4, day 8 and so on.
•i.e., on days those are multiples of 4.
VP (Sales) visits the plant every 6th day (after a gap of 5 days).
•If VP (Sales) visited the plant on day 0, he will visit again on day 6, day 12 and so on.
•i.e., on days those are multiples of 6.
 
So, all 3 VPs will visit the plant together again on a day that is a multiple of 3, 4 and 6 or on a day that is a common multiple of 3, 4 and 6.
The first such common multiple is the LCM of 3, 4 and 6 = 12.
 
The last date on which all three VPs met the CEO was on Jan 3, 2012.
The next dates on which their visits will coincide are Jan 15, 2012, Jan 27, 2012, and Feb 8, 2012.
 
The CEO is on leave from Jan 5, 2012 to Jan 28, 2012. Therefore, the CEO will meet the VPs on February 8th, 2012.
 
 

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