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Two-digit numbers

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Two-digit numbers

by umaa » Tue Jun 30, 2009 9:42 pm
If a and b are two-digit numbers that share the same digits, except in reverse order, then what is the sum of a and b?

1. a - b = 45

2. The difference between the two digits in each number is 5.
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Source: — Data Sufficiency |
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by tohellandback » Tue Jun 30, 2009 10:18 pm
IMO E
1)not suff
if digits are x and y
10X+y-10Y-x=45
x-y=5

2)same not suff
comined we still have the same equation
The powers of two are bloody impolite!!
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Re: Two-digit numbers

by rahulg83 » Wed Jul 01, 2009 3:13 am
umaa wrote:If a and b are two-digit numbers that share the same digits, except in reverse order, then what is the sum of a and b?

1. a - b = 45

2. The difference between the two digits in each number is 5.
Consider 83, 38 and 72, 27...
both sets satisfy above statements..hence E
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