On which number line do the points represent-7 and 1 over 2 and +1

the number line that represents the number is b so the answer for your question is b

what is the original number? you forgot to add it.

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.