Challenge Problem Showdown

Manhattan GMAT invites you to test your GMAT knowledge for a chance to win! Each week, we will post a new Challenge Problem for you to attempt. If you submit the correct answer, you will be entered into that week’s drawing for a free Manhattan GMAT Prep item. The value of the item increases as more people enter the contest so tell your friends to get out their scrap paper and start solving!


Please note: We email the winner directly every week, and provided we then receive consent from the winner we post his or her name on our Facebook Fan Page.


Good luck! These are tough problems!

This Week's Problem: "Better Bidhouse"

It takes Abby a hours to build a birdhouse. When Becky and Caroline help Abby, the three of them can build an identical birdhouse in half the time. If it takes Becky and Caroline b and c hours, respectively, to build a birdhouse on their own, which of the following statements is true?

(A)
(B)
(C)
(D)
(E)

Please log in to submit or view your answer to this week's Challenge Problem.

Weekly Challenge Updates

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Weekly Prizes

Each week, we will draw a name from all of the correct answer submissions. The winner will receive the appropriate prize from the list below based on the total number of entries. The more people who enter, the better the reward!


EntriesPrize
0-99One (1) Manhattan GMAT Strategy Guide ($26 value)
100-249Two (2) Manhattan GMAT Strategy Guides ($52 value)
250-499All Eight (8) Manhattan GMAT Strategy Guides ($208 value)
500+The Complete Prep Set
($280 value)