1.

A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:

Answer»

24



Let the ten's and unit's digit be x and 8/x respectively. 

Then, 

(10x + 8/x) + 18 = 10 * 8/x + x 

9X2 + 18x - 72 = 0 

X2 + 2x - 8 = 0 

(x + 4)(x - 2) = 0 

x = 2 

So, ten's digit = 2 and unit's digit = 4. 

Hence, REQUIRED NUMBER = 24.



Discussion

No Comment Found

Related InterviewSolutions