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16 Nov 2017, 09:32
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E
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Difficulty:
25%
(medium)
Question Stats:
73% (01:21) correct
27%
(01:27)
wrong
based on 81
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If there are x students in a class and x>90, what is x?
(1) Sum of digits of x is divisible by 9
(2) x+4 is a three-digit number.
self made
(1) Sum of digits of x is divisible by 9
(2) x+4 is a three-digit number.
self made
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
meganbailey
16 Nov 2017, 10:01
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(1): x could be 90, 99, or any # greater than 90 divisible by 9. Therefore, we don't know the specific value for x... INSUFFICIENT.
(2): The lowest possible positive three digit number is 100. 100-4=96. However, x could be any number above 96 and below 1000-4=996. No specific value for x... INSUFFICIENT.
(1) and (2): Find a # between 96 and 996 whose digits are divisible by 9. Ex. 99, 108, etc. Therefore, we don't know the specific value for x... INSUFFICIENT.
The answer is E.
(2): The lowest possible positive three digit number is 100. 100-4=96. However, x could be any number above 96 and below 1000-4=996. No specific value for x... INSUFFICIENT.
(1) and (2): Find a # between 96 and 996 whose digits are divisible by 9. Ex. 99, 108, etc. Therefore, we don't know the specific value for x... INSUFFICIENT.
The answer is E.
27 Nov 2017, 18:50
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chetan2u
(1) Sum of digits of x is divisible by 9
x>90 and multiple of 9..
x can be 99 or 108 or 9999
insuff
(2) x+4 is a three-digit number.
this means least value of x is ..
x+4=100....x=96
max value .... x+4=999...x=995
various possiblities
Insuff
combined
x can be 99,108..till 990
insuff
E
