Question

Explanation a number consists of two digits whose sum is 9. if 27 is subtracted from the number, its digits are reversed. the number is :

Answer 1

ans is 63

let the no is 10x+y the
acc. to question x+y=9. ...eq1
and also
10x+y-27=10y+x. ....eq2


on simplify eq2
x-y=3. ....eq3

on solving eq1&3
we get x=6,y=3
hence tha no is 63

Answer 2

Answer:

36 or 63 can be the number

Step-by-step explanation:

Assuming

x as tens digit

y as ones digit

Their sum :

x + y = 9 ..... (i)

Number formed :

10x + y

Interchanging the digits :

10y + x

According to the question :

➡ (10x + y) - (10y + x) = 27

➡ 9x - 9y = 27

➡ 9(x - y) = 27

➡ x - y = 27/9

➡ x - y = 3 ..... (ii)

Subtracting both the equation :

$\bf \: x + y = 9 \\ { \underline{ \bf{x - y = 3}}} \\ \implies \bf \: 2x = 6 \\ \implies \bf \: x = 3$

Substituting the value of x in equation (i) :

➡ x + y = 9

➡ 3 + y = 9

➡ y = 6

Hence

The number can be 10x + y

or, 10(3) + 6

or, 36 either 63