Question

It is an odd number between 10 and 30.The two digits of my number add up to 5.The difference between the two digits of my number is 1.What is my number?

Answer 1

Answer:

$23$

Step-by-step explanation:

Let the digits be and $x$ and $y$.

then,

$x+y =5.......(i)\\x-y=1 .........(ii)$

$(i) + (ii)\\x+y+x-y = 5+1\\2x=6\\x=3\\\\Then: y = 2$

since it is an odd number between 10 and 30

Hence the number is 23