Question

The sum of the digits of a two - digit number is 10. The unit's digit is four times the ten's digit. Find the numbers. ​

Answer 1

Let the original number be xy=10x+y

Digit's on 10

′

s place=x

Digit in units place=y

Given that x=4y

reversed number yx=10y+x

yx=xy−27

10y+x=10x+y−27

9x=9y+27

x=y+3

x=4y

4y=y+3

3y=3

y=1

x=4(1)=4

Answer 2

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