a. Quantitative Ability

Greatest number

Tagged: difference, number

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October 6, 2011 at 1:36 pm #2865
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Q. The greatest number that always divides the difference of the number and the number formed by reversing its digits ?
A.18
B.27
C.36
D.45
please tell the approach?

Q asked by Vikram Kumar
October 6, 2011 at 1:43 pm #2997
Wonder Boy
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Let the original number 10X+Y
number formed by reversing its digit = 10Y+ X
now the difference (10Y+X) – (10X+Y) = 9Y-9X = 9 (Y-X)
so the number will be divisibe by 9
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