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CAT-2006-Previous Years Paper

Question
23 out of 25
 

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?



A 5
B 6
C 7
D 8
E 10

Ans. B

We know that xyyx = 9 (xy), where xy is a two digit number and xyyx.

So, xy = 2

The possible pairs of (x, y) is (3, 1) (4, 2) (5, 3) (6, 4), (7, 5) (8, 6) (9, 7)

But we want the number other than 13 so, there are 6 possible numbers are there i.e., 24, 35, 46, 57, 68, 79.

So, total possible numbers are 6.

CAT-2006-Previous Years Paper Flashcard List

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