Question

In a two digit number the digit in ten's place exceeds the digit in unit's place by 4. The sum of the digits is 1/7 of the number, then the digit at the unit's place is

Answer 1

Step-by-step explanation:

let's number is xy

according to the question

x - y = 4

and

x + y = 1/7 (10x + y)

7x + 7y = 10x + y

7y - y = 10x - 7x

6y = 3x

2y = x

put the value of x in equation first

x-y = 4

2y - y = 4

y = 4

then x = 8

so number is 84

digit at unit place is 4