Why was my answer marked wrong in challenge if your explanation was as stated below

Question

Even if your strings contain numbers, they are still added as strings rather than integers. Adding a string to a number produces an error, as even though they might look similar, they are two different entities.

Answer 1

In most programming languages strings and numbers are completely different things.

Example:
"5" (a string) is not equal to 5 (a number)

In most programming languages addition can be done only between numbers.

Example:
4 + 7 = 11
(number + number = number)
4 + "7" = error
(number + string = error)