Question

If a cleaning crew can clean 1 over 12 of a building in 1 over 2 hour, how much time will it take to clean the entire building? (5 points)

a
7 over 12 hour

b
1 over 6 hour

c
6 hours

d
10 hours

Answer 1

Answer: C

Explanation:

it would take six hours, and i solved this simply. i just kept counting up. if 1/12 of the building is cleaned in half an hour, then 2/12 of the building is cleaned in 1 hour. i just kept adding 1/12th of the building per half hour, and figured out that it would take 6 hours to clean the whole building.