SOLUTION: 15 scientists working 6 hrs. a day can make a big machinery in 20 days. In how many days 5 scientists make that machinery working 12 hrs. a day?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: 15 scientists working 6 hrs. a day can make a big machinery in 20 days. In how many days 5 scientists make that machinery working 12 hrs. a day?      Log On


   



Question 118234: 15 scientists working 6 hrs. a day can make a big machinery in 20 days. In how many days 5 scientists make that machinery working 12 hrs. a day?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
(Number of scientists)(hours worked per scientist) = Total hours
(rate1) = (rate2)
rate1 = rate2 = (1 big machine / total hours)
1%2F%286%2A15%2A20%29+=+1%2F%285%2A12%2Ad%29
1%2F1800+=+1%2F60d
60d+=+1800
d+=+30days answer