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Re: Data Sufficiency - Find value of B [#permalink]
11 Nov 2009, 21:02

kalpeshchopada7 wrote:

If A, B and C are digits such that AB is not equal to 0, what is the value of B. 1. AB +BA AAC

2. A = 1.

I am confused with the answer explanation provided to me. need explanation.

I used this approach: Using 1---A,B#0 since A+B gives a different digit. Also, since AB+BA is giving a 3 digit #, When we add units place (B+A) we need to carry forward 1. When we add the ten's digit , we have A+B+1 giving the unit's place "A". This is only possible if B=9 So statement 1 is sufficient.

Re: Data Sufficiency - Find value of B [#permalink]
12 Nov 2009, 08:28

Here is how I solved the problem:

From Statement 1:

I started by seeing what the problem would look like if we assumed A = 0

1B +B1 11C Possible!

Then seeing what it would look like if we assumed A = 2 2B +B2 22C Impossible! There is no way we can add two two digit numbers if and get over 200! So we know that A cannot be greater than 1.

From 1B +B1 11C

It is easy to see that B must be a high number like 8 or 9 to hold true: 19 +91 110

SUFFICIENT!

gmatclubot

Re: Data Sufficiency - Find value of B
[#permalink]
12 Nov 2009, 08:28

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