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Problems on Numbers - General Aptitude

Q1:

The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?

A 3

B 4

C 9

D Cannot be determined

E None of these

ANS:B - 4

Let the ten's digit be x and unit's digit be y. Then, (10x + y) - (10y + x) = 36  9(x - y) = 36  x - y = 4.