SOLUTION: A printing press produces 4,200 posters per hour. at this rate,in how many minutes can the printing press produces 840 posters (A) 0.2 (B) 1.5 (C) 5 (D) 12 (E) 7

Algebra ->  Proportions  -> Lessons -> SOLUTION: A printing press produces 4,200 posters per hour. at this rate,in how many minutes can the printing press produces 840 posters (A) 0.2 (B) 1.5 (C) 5 (D) 12 (E) 7      Log On


   

Question 296013: A printing press produces 4,200 posters per hour. at this rate,in how many minutes can the printing press produces 840 posters
(A) 0.2 (B) 1.5 (C) 5 (D) 12 (E) 70

Answer by unlockmath(1688) About Me  (Show Source):
You can put this solution on YOUR website!
Hello,
WE can set up a proportion as follows:
4200/60=840/x (Hint: convert hour to minutes)
Cross multiply to get:
4200x=50400 Divide both sides by 4200 to get:
x=12 minutes
Make sense?
There's a book I wrote that explains the basics at:
www.math-unlock.com