AC Lim's answer to O help's Primary 6 Maths Measurement Singapore question.

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AC Lim
Ac Lim's answer
13087 answers (A Helpful Person)
1st
Need more worker if less days given and less workers if more days given. Hope this helps
O help
O Help
7 months ago
Ya.. But how to tell students it's not the usual fruits and $ kind of ques...

Thanks
AC Lim
AC Lim
7 months ago
Tell the kid that the job have 720 parts to clean. (60×12 = 720)
1 worker can clean 1 part in 1 day.
60 workers can clean 60 parts in 1 day.
So, 60 workers take 12 days to complete.

Then now,
30 days
1 worker clean 1 part in 1 day.
1 worker clean 30 parts in 30 days.
30 parts → 1 worker
720 parts = 720÷ 30 = 24 workers.