"m is two digit number and 2m is a three digit number, what is the unit digit of m?"
(1) the unit number of 2m is 4
(2) the unit number of m is the same as the tens number of 2m
unit digit question
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I am getting C)
m is two digit number and 2m is a three digit number
50<=m<99
Stmt I
the unit number of 2m is 4
104 - then m is 52
114 - then m is 57
INSUFF
Stmt II
the unit number of m is the same as the tens number of 2m
m is 50 2m 100
m is 74 2m is 148
2 different answers
INSUFF
Combined
numbers possible
m = 62 2m=124
m = 87 2m = 174
2 different units digits i.e 2 and 7
INSUFF
E)
m is two digit number and 2m is a three digit number
50<=m<99
Stmt I
the unit number of 2m is 4
104 - then m is 52
114 - then m is 57
INSUFF
Stmt II
the unit number of m is the same as the tens number of 2m
m is 50 2m 100
m is 74 2m is 148
2 different answers
INSUFF
Combined
numbers possible
m = 62 2m=124
m = 87 2m = 174
2 different units digits i.e 2 and 7
INSUFF
E)
Last edited by cramya on Fri Dec 05, 2008 10:31 am, edited 2 times in total.
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My request is dont avoid this please on the real GMAT.Hope I will not get any question involving picking numbers in real GMAT.
I really hate to pick numbers
Sometimes its time consuming but very effective and reliable(all of us need to get better and faster at it for sure )
Also for some problems like this and others(some remainder problems) it comes in handy!