Question

the sum of the digits of a two digit number is 9 . the number is 6 times the units digit .find the number class 8 playing with numbers​

Answer 1

The number is 36.

Let the tens digit be  a  and the units digit will be  b.  

The given conditions are:

a+b=9⟹a=9−b  

10a+b=6b  

⟹10(9−b)+b=6b  

⟹90−10b+b=6b  

⟹90−9b=6b  

⟹90=15b  

⟹b=6  

If  b=6,  then  a=3.  

Proof:

36=6×6  

So the number is  36

Answer 2

Answer:

let the unit digit is x

tens digit =9-x

AtoQ

90-9x=6x

90-15x

x=90/15=6

90×-9×6

90-54

36

HOPE THIS IS USEFUL