If the number obtained on interchanging the digits of a 2 digit number is 18 more than the original ...........

Quantitative Aptitude ( CCS) Number System

If the number obtained on interchanging the digits of a 2 digit number is 18 more than the original number and the sum of the digit is 8.Then what is the original number?

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Explanation:

Answer
Answer - A) 35
Explanation :
Unit digit= x ; Ten’s digit = (8-x)
[10(8-x)+x] – [10x+(8-x)] = 18
80-10x+x-10x-8+x = 18
-18x = 18-80+8
18x = 54
X = 54/18 = 3
8 – x = 8 – 3 =5
Hence the number is 35