Question

31x is divisible by 2 if x=

Answer 1

since we know that any number which has to be divisible by 2 should be an even number so to make 31 and even number we have to multiply it with an even number so the answer is that when X will be an even number then 31 X will be divisible by 2
I hope you got it

Answer 2

if x= 2
$31 \times 2 = 62 \\ \frac{62}{2} = 31$
x can be any even number.for eg 2,4,6,8 etc