GMAT

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A drain pipe can drain a tank in 12 hours, and a fill pipe can fill the same tank in 6 hours. A total of n pipes which include a few fill pipes and the remaining drain pipes can fill the entire tank in 2 hours. How many of the following values coul... Read more

A drain pipe can drain a tank in 12 hours, and a fill pipe can fill the same tank in 6 hours. A total of n pipes – which include a few fill pipes and the remaining drain pipes – can fill the entire tank in 2 hours. How many of the following values could ‘n’ take?
a)   24               b)   16               c)   33               d)   13               e)   9                 f)   8

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What digit appears in the units place in the number obtained when 2320 is multiplied out?


What digit appears in the units place in the number obtained when 2320 is multiplied out?


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What digit appears in the units place in the number obtained when 2320 is multiplied out?



What digit appears in the units place in the number obtained when 2320 is multiplied out?



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ABCDE is a regular pentagon. O is a point inside the pentagon such that AOB is an equilateral triangle. What is ?OEA?


ABCDE is a regular pentagon. O is a point inside the pentagon such that AOB is an equilateral triangle. What is ?OEA?


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