Question

D. sh 864000 C. sh 216000 24. Eighteen pupils were given a playground to clear in 1 h 40 min. If six of the pupils did not turn up, how much longer did it take the rest of the pupils to clear the playground? A. 33%, min C. 2 h 30min B. 50min D. 3 h 20min​

Answer 1

C) 2hours and 3 minutes

Explanation:

rate x number of people x time = 1 job

Rate:

`(1)/(18(100))` To get 1 job done, it takes 18 people and 100 minutes (1 hours + 40 minutes is 60 + 40 or 100 minutes

`(1)/(18(100))` x 12 x time = 1

`(12)/(1800)` t = 1 Multiply both sides by
`(1800)/(12)`

t =
`(1800)/(12)` = 150

The time is 150 minutes, which is the same as 2 hours and 30 minutes.