Machine A produces pencils at a constant rate of 9,000 pencils per hour, and machine B produces pencils at a constant rate of 7,000 pencils per hour. If the two machines together must produce 100,000 pencils and if each machine can operate for at most 8 hours what is the least amount of time, in hours, that machine B most operate?
Answer: 4
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
Work Problem
This topic has expert replies
-
tohellandback
- Legendary Member
- Posts: 752
- Joined: Sun May 17, 2009 11:04 pm
- Location: Tokyo
- Thanked: 81 times
- GMAT Score:680
this is simple..
we want the lest time for machine B. let machine A run the whole 8 hours. A
produces 72,000 pencils.
rest 28,000 must be produced by B.
so 4 hours is the answer
we want the lest time for machine B. let machine A run the whole 8 hours. A
produces 72,000 pencils.
rest 28,000 must be produced by B.
so 4 hours is the answer
The powers of two are bloody impolite!!
