@Mrbankstips
each number is multiplied by 5, then it is written in diagonally.
So, it becomes,
2×5=10
3×5=15
4×5=20
5×5=25.
There is missing number is diagonally placed to 5.
So, it must be multiple of 5.
So, ? is replaced by 25.
Hence, the missing number will be 25.
#Bankstrivia