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Q.


A two-digit number is 4 times the sum of its digits. If 18 is added to the number, the digits are reversed. Find the number.

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a

30

b

24

c

15

d

11 

answer is B.

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Detailed Solution

Let the tens and unit digit of number are =x, y respectively
First condition:
⇒10x+y=4(x+y)⇒2x=y Second condition:
⇒10x+y+18=10y+x ⇒x-y=-2 ⇒x-2x=-2 ⇒x=2 ⇒y=4  ∴   two digit number =24
Correct option is 2.
 
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