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28 May 2017, 02:12
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C
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Difficulty:
15%
(low)
Question Stats:
79% (00:59) correct
21%
(01:09)
wrong
based on 102
sessions
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Not Attempted Yet
What is the value of the positive, two-digit number x?
(1) The sum of its digits is 4.
(2) The difference of its digits is 4.
(1) The sum of its digits is 4.
(2) The difference of its digits is 4.
Luckisnoexcuse
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28 May 2017, 02:18
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10x + y is the number
(1) says x + y = 4 many possibilities including x=4 and y=0
not sufficient
(2) says x-y = 4 many possibilities including x = 4 and y= 0
not sufficient
combining only x=4 and y=0 is the unique solution and hence C
Sent from my iPhone using GMAT Club Forum
(1) says x + y = 4 many possibilities including x=4 and y=0
not sufficient
(2) says x-y = 4 many possibilities including x = 4 and y= 0
not sufficient
combining only x=4 and y=0 is the unique solution and hence C
Sent from my iPhone using GMAT Club Forum
28 May 2017, 02:36
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What is the value of the positive, two-digit number x?
(1) The sum of its digits is 4.
If a and b are the two digits, knowing a+b = 4 we may have many options, and cannot clearly give a two digit number,x.
Hence, insufficient.
(2) The difference of its digits is 4.
If a and b are the two digits, knowing a-b = 4 we may have many options, and cannot clearly give a two digit number,x.
Hence, insufficient.
But combining the statements, we can clearly give the values of a(4) and b(0).(Option C)
(1) The sum of its digits is 4.
If a and b are the two digits, knowing a+b = 4 we may have many options, and cannot clearly give a two digit number,x.
Hence, insufficient.
(2) The difference of its digits is 4.
If a and b are the two digits, knowing a-b = 4 we may have many options, and cannot clearly give a two digit number,x.
Hence, insufficient.
But combining the statements, we can clearly give the values of a(4) and b(0).(Option C)
