Question

the sum of a digit of a two digit number is 9 the number is 6times the unit digit . find the no.

Answer 1

let the 2 digit number be xy

x+y=9

we can write x=9-y

10x+y=6y

10(9-y) =5y

90=15y

y=6

x=3

number =36

Answer 2

Answer:

Step-by-step explanation:

x+y=9

x=9-y

10x+y=6y

=>10(9-y)+y=6y

=>90-10y+y=6y

=>90-9y=6y

=>90=6y+9y

=>90=15y

=>6=y

Since x+y=9

x+6=9

x=3

Since x+y=9,3+y=9andy=6

So, the ans. is 36..