0 votes 0 votes When you reverse the digits of the number $13,$ the number increases by $18.$ How many other two digit numbers increase by $18$ when their digits are reversed? $5$ $6$ $7$ $8$ $10$ Quantitative Aptitude cat2006 quantitative-aptitude number-systems + – go_editor asked Dec 28, 2015 • edited Mar 29, 2022 by Lakshman Bhaiya go_editor 13.9k points 668 views answer comment Share See all 0 reply Please log in or register to add a comment.
Best answer 4 votes 4 votes Let 10x + y be a two digit number. Its reverse = 10y + x Now, 10y + x – 10x – y = 18 9(y – x) = 18 y – x = 2 Thus y and x can be (1, 3), (2, 4), (3, 5), (4, 6), (5, 7), (6, 8) and (7, 9) Other than 13, Hence, option (2)6 is the Answer. Leen Sharma answered May 26, 2016 • selected May 27, 2016 by Arjun Leen Sharma 11.5k points comment Share See all 0 reply Please log in or register to add a comment.