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Quantitative Aptitude

Last Two Digits of a Number

The differenc...

Question

The difference between a two digit number and the number formed by reversing it is 70. Then the difference between the two digits of the number is.

A

4

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B

1

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C

6

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D

2

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E

None of these

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Solution

The correct option is E
None of these

10a + b - (10b + a) = 70

10( a - b) + b - a = 10 $\times$ 7 + 0

a - b = 7

b - a = 0

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