56.7
31.5 x 1.8 = 56.7, and 56.7 / 1.8 = 31.5
The sum of all the odd numbers from 1 to 59 is 900.
Answer : x^4
Do you need an explanation?
C 12.5 hours it would take this long because it adds 3 more people and then you like do something and you subtract that Number by 20 and get 12.5 hours