Bunuel wrote:

The smallest 3 digit positive integer obtained by adding two positive two digit numbers, one of which has the units and tens places interchanged as the other is _____

A. 100

B. 101

C. 105

D. 110

E. 121

Ans: D

Solution: as those numbers has digit interchanged and added to get the three digit number means the sum is: = 11(a+b)

so the final number must be multiple of 11. we are looking for smallest three digit number multiple of 11= 110 Ans

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