The quotient of a number and three is negative four

quotient of a number and three: n/3

Step-by-step explanation:

for more: n/3 + 4

at least nine: ≥ 9

n / 3 + 4 ≥ 9

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.