Question

I need help with 3 please... I don’t know how to do it and I know my answer is wrong... please

Answer 1

It will take 20 hours I think because 8,16,32,64 is the sequence of cars waxed and 3,6,12,24 are the hours, 64 take 4 away = 60. and then 24, I took 4 away from 64 so it would be 20 if I took away 4