Question

A number consists of two digit whose sum Is 5. If 9 is substracted from the number the digits are reversed. Find the number

Answer 1

Step-by-step explanation:

imagine,first digit is x

second digit is y

so,number is x+10y

1stly,x+y=5

2ndly,x+10y-9=10x+y

or,x+10y-10x-y=9

or,9y-9x=9

or,9(y-x)=9

or,y-x=9/9=1

or,y=x+1

now,x+(x+1)=5

or,x+x+1=5

2x+1=5

2x=5-1=4

x=4/2=2

so,y=x+1=2+1=3

so,number is,x+10y=2+10×3

=2+30

=32

so 32 is the number.

Answer 2

Answer:

32

Step-by-step explanation:

let xy be the number

and unit place be y

and tens place be x

x+y=5 ~1

10x+y-9=10y+x

10x-10y+y-x=9

9x-9y=9

9(x-y)=9

x-y=9/9

x-y=1 ~2

~1+~2

x+y+x-y=5+1

2x=6

x=6/2

x=3

~2

x-y=1

3-y=1

y=2

the no is

32