Question

The sum of the digits of a two-digit number is 4.
The number got by interchanging the digits is 18 less than the original number. What is the number ​

Answer 1

Answer:

31

Step-by-step explanation:

let X andYbe first and second digits

then x+y=4 eq1

10x+y-18=10y+X

9x-9y=18

x-y=2. eq2

eq1+eq2=>2x=6

X=3

eq1-eq2=>2y=2

y=1

so the no.is 31