solve the following problem. 30 people can complete a work in 12 days. How many days will 20 people take for completing the same work
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Answered by
1
let x be the rate of work done by one person, units are in jobs/day.
30 people complete 1 job in 12 days:
=> 30x = 1/12
solve for x by dividing both sides by 30:
=> x = 1/(12*30)
Find 20x, to get the amount of time needed to get 1 job done for 20 people. Multiply both sides by 20.
=> 20x = 20/(12*30)
=> 20x = 1/18
Therefore the working rate for 20 people is 1 job per 18 hours.
30 people complete 1 job in 12 days:
=> 30x = 1/12
solve for x by dividing both sides by 30:
=> x = 1/(12*30)
Find 20x, to get the amount of time needed to get 1 job done for 20 people. Multiply both sides by 20.
=> 20x = 20/(12*30)
=> 20x = 1/18
Therefore the working rate for 20 people is 1 job per 18 hours.
Answered by
6
30 people .......12 days
20 people.......x days
30/20= 12/x
30/20= x/12
x=(30•12)/20
x= 360/20
x= 18 days
20 people.......x days
30/20= 12/x
30/20= x/12
x=(30•12)/20
x= 360/20
x= 18 days
parvati10:
please answer my last question
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