sum!

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rajatvmittal: Master | Next Rank: 500 Posts; Posts: 110; Joined: Sat Feb 11, 2012 5:01 am; Thanked: 2 times

by rajatvmittal » Tue Mar 13, 2012 6:47 am

The sum of positive integers x and y is 77. what is the value of xy?
a) x=y+1
b) x and y have the same tens digit.

Source: Beat The GMAT — Data Sufficiency | Tue Mar 13, 2012 6:47 am

killer1387: Legendary Member; Posts: 581; Joined: Sun Apr 03, 2011 7:53 am; Thanked: 52 times; Followed by:5 members

by killer1387 » Tue Mar 13, 2012 6:58 am

rajatvmittal wrote:The sum of positive integers x and y is 77. what is the value of xy?
a) x=y+1
b) x and y have the same tens digit.

a) 38,39
b) tens digit can only be 3 and to satisfy the condition

x+y=77

hence it has to be 38 and 39

IMO D

rajatvmittal: Master | Next Rank: 500 Posts; Posts: 110; Joined: Sat Feb 11, 2012 5:01 am; Thanked: 2 times

by rajatvmittal » Tue Mar 13, 2012 7:08 am

Oh yes!...silly... what was i thinking then...!!!

Never mind. thanks

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