SOLUTION: please help me to solve this problem. Thanks. If 30 laborers working 7 hours a day can finish a piece of work in 18 days, how many laborers working 6 hours a day can finish it in

Question 605828: please help me to solve this problem. Thanks.
If 30 laborers working 7 hours a day can finish a piece of work in 18 days, how many laborers working 6 hours a day can finish it in 30 days?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
(1) 30 laborers working 7 hours a day can finish a piece of work in 18 days
(2) If they only work 1 hour a day, it will take them 7 times longer to finish, so
(3) 30 laborers working 1 hour a day can finish a piece of work in 126 days
(4) If they work 6 hours a day, It will take them 1/6 as long to finish
(5) 30 laborers working 6 hours a day can finish a piece of work in 21 days
(6) 7 times as many laborers can finish in 1/7 as many days, so
(7) 210 laborers working 6 hours a day can finish a piece of work in 3 days
(8) If they take 10 times longer to finish, they only need 1/10 as many laborers
(9) 21 laborers working 6 hours a day can finish a piece of work in 30 days

RELATED QUESTIONS
15 men working 7 hours a day can finish a piece of work in 15 days. How many days will... (answered by ankor@dixie-net.com)

If a woman works for 3 1/2 hours per day, she can finish a piece of work in 10 days. How... (answered by Theo)

ggreg working 8 hours a day can finish a piece of work in 16 days.how many hours per day... (answered by Cromlix)

If 54 men working 10 hours a day can finish a work job in 15 days, how many men are... (answered by Alan3354)

While working 7 hours day, A alone can complete a piece of work in 6 days and B alone in... (answered by solver91311)

12 men working 7 hours a day can finish a job in 6 days. How many more hours a day must 8 (answered by ankor@dixie-net.com)

Can someone please help me solve this work word problem? Tom and Sam can finish a... (answered by stanbon)

1.'A' works twice as fast as 'B'. If both of them together take 6 days to complete the... (answered by josmiceli,vvnrichards)

A can do a piece of work in 7 days of 10 hours each & B can do it in 5 days of 12 hours... (answered by fcabanski)