SOLUTION: eight mechanical experts can assemble 4 computers in 5 hours. how many mechanical experts will be needed to assemble 21 computers in 10 hours?

Question 1082700: eight mechanical experts can assemble 4 computers in 5 hours. how many mechanical experts will be needed to assemble 21 computers in 10 hours?
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.

Your proportion is

 = ,

where x is the number under the question.


Solve for x.


4*x*10 = 21*8*5  ====>  x =  = 21.


Answer.  21 experts.

Notice that each side of the proportion express the work rate (productivity) in the units "computer per man-hour".

Making such proportion is the easiest way to solve the problem.

------------
It is typical joint work problem. See the lesson
- Rate of work problems
in this site.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
- ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lesson is the part of this textbook under the topic "Rate of work and joint work problems" of the section "Word problems".

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