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raghu
Senior Member

USA
37 Posts

 Posted - 09/04/2008 :  13:09:32 1. Superman and Batman(together) peel a bucket of potatoes in 20mts, superman and cinderella in 15 minutes and cinderella and Batman in 12 minutes. How long does it take superman to peel a bucket of potatoes?2. How many 3 letter sequesnce can be made using letters in the word BOOKKEEPER? (for example 'OKO is acceptable; OPP is not acceptable).Any help is appreciated.

Subhotosh Khan

USA
9117 Posts

 Posted - 09/04/2008 :  14:10:11 quote:Originally posted by raghu1. Superman and Batman(together) peel a bucket of potatoes in 20mts, superman and cinderella in 15 minutes and cinderella and Batman in 12 minutes. How long does it take superman to peel a bucket of potatoes?2. How many 3 letter sequesnce can be made using letters in the word BOOKKEEPER? (for example 'OKO is acceptable; OPP is not acceptable).Any help is appreciated.Number 1 is a simple problem - what have done? Please share with us.For #2How many letters are ther in total - in BOOKKEEPERHow many B's, how many K's, How many R's....If all the letters were different and - you were to choose three letteres - how many ways you could have chosen those?Now work from there .. show some thoughts...

raghu
Senior Member

USA
37 Posts

 Posted - 09/04/2008 :  14:20:47 1. s + B can do 1/20 of the job in 1 minuteS + c can do 1/15 in 1 minutec + B can do 1/12 in 1 minuteAdding all these 2(s + C + B) can do 720/360 of or s + c + b can do the whole job 1 1 minue.From here on I have no clue.as far as the second problem, I still don't have a clue.

Subhotosh Khan

USA
9117 Posts

 Posted - 09/05/2008 :  11:44:48 For the second problem there are 10 letters and youare choosing 3 at a time.If all the letters were different, you could have chosen 10P3 ways.Now continue....
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