Question

The ratio of a two-digit natural number to a number formed by reversing its digits is 4: 7. The number of such pairs is​

Answer 1

Answer:

Thus the 4 no pairs are:

(12,21),(24,42),( 36,63), (48,84)

Step-by-step explanation:

let 10's digix and 1' digit=y

Then N=10x+y

and the number on reversing digits

Say N'=x+10y

Given that

(10x+y)/(x+10y)=4/7

7*(10x+y)=4(x+10y)

70x+7y=4x+40y

66x=33y

2x=y

Thus the numbers are x(2x) ,(2x)x

If x=1 No are  12,21

So x=1 2,3,4

Thus the 4 no pairs are:

(12,21),(24,42),( 36,63), (48,84)