Question

The sum of digit of a two digit number is one seventh of the number

Answer 1

Let us assume that x is on 10’s place and y on 1’s place then as per given conditions:

x+y=7 ……(1)

x=0.75y ……(2)

From equation 1 & 2:

1.75y=7

y=(7/1.75)

y=4 …..3)

From equation 1 & 3:

x+4=7

x=3

So the number is 34.