-8 I think because it has a pattern
621,864
Since the 4 is a smaller digit than a 5, the 6 in the tens place would stay the same while the 4 would become a 0.
There’s no photo so we can’t help you sorry :(
C and E are the right ones
Remove these 7 guys from your number
so people who took buses are 318
now divide 318/6 to know how many phone did each bus have