Answer:
what
Step-by-step explanation:
is the questionn
He worked as a carpenter for 12 hrs. and as a blacksmith for 18.
In this question,We have to group the given expression to get 5 as the final answer .

Here we put 5 +20 in parenthesis, that is

And we do the required operations, that is

And we get 5.
It is definitely the letter B because of the liner parent function