ExamCompetition Forum Question Papers Ask A Question Mock Test Learn & Earn Sign Up Login Menu



0 vote

 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:

Asked on by | Votes 0 | Views: 33 | Tags: quantitative aptitude     | number system     | Add Bounty

 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:

A). 18

B). 24

C). 42

D). 81


Share on Facebook      Share on Whatsapp       Share on Twitter




1 answers

0 vote
Answered by on | Votes 0 |

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.

Join Telegram Group




Answer This Question

Name:
Email:
Answer :
Sum of (1+3)
Submit: