Number System
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Q.

When 75% of a two-digit number is added to it, the digits of the number are reversed. Find the ratio of the unit's digit to the ten's digit in the original number.

 A.

1:2

 B.

1:4

 C.

2:1

 D.

3:2

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Solution:
Option(C) is correct

Suppose the number is $xy$

we have, $10x+y +\dfrac {75}{100} × (10x+y) = 10y+x$

Hence $\dfrac{y}{x} = \dfrac{2}{1}$


(2) Comment(s)


Harsheen
 ()

How to solve it ???



Ravish
 ()

the answer is given as per the reversed number