SOLUTION: Javier and Bobby are rolling the pennies in their penny jar. Javier can make 4 rolls in 10 minutes and Bobby can make 9 rolls in 15 minutes. (a) Working together, how long will it

Question 1084590: Javier and Bobby are rolling the pennies in their penny jar. Javier can make 4 rolls in 10 minutes and Bobby can make 9 rolls in 15 minutes.
(a) Working together, how long will it take them to roll $50 worth of pennies? (Penny rolls have 50� per roll.)
76 problem solving in mathematics
(b) If it takes them 31 hours to roll all of the pennies, how much 2
money do they have?
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
Their rate together, in ROLLS per MINUTES:

---------- 1 roll per minute

You can answer (a) and (b).

-
Just (b) part-way only:
31 hours, how many rolls? How much money?
x rolls

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