If 12 workers can plant 1320 seedlings in five hours, how long would it take 8 workers or 15 workers?

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Answer 1 · 2017-08-12T15:28:12

#8# workers = #7 1/2# hours
#15# workers = #4# hours

Firstly divide #1320# by #12# to get #110#.

#1320/12 = 110#

Then divide #110# by #5# to get the amount planted per person per hour, which is #22#.

#110/5 = 22#

Then times #22# by #8# to get #176#, then divide that by #1320# to get the amount of hours, which is #7 1/2#.

#22 times 8 = 176#

and,

#1320/176 = 7 1/2# hours.

Then do exactly the same for 15 workers.

#22 times 15 = 330#

#1320/330 = 4# hours.