Question

The sum of the digits of a two-digit number is 8. One's digit is two more than the ten's digit. Find the value of one's digit.
1. 5
2. 3
3. 2
4. 9

Answer 1

Correct Answer - Option 1 : 5

Given

Ten'digit + One's digit = 8

Calculation

Two-digit number is formed of one's digit and ten's digit.

Let the ten's digit and one's digit is x and y

According to question

y + x = 8.    ----(1)

y = x + 2     ---- (2)

From (1) and (2)

x + 2 + x = 8

2x + 2 = 8

2x = 6

x = 3

y = 3 + 2

y = 5

∴ One's digit is 5