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 couple of problems I need help with

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T O P I C    R E V I E W
raghu 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.
3   L A T E S T    R E P L I E S    (Newest First)
Subhotosh Khan 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....
raghu Posted - 09/04/2008 : 14:20:47
1. s + B can do 1/20 of the job in 1 minute
S + c can do 1/15 in 1 minute
c + B can do 1/12 in 1 minute
Adding 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 Posted - 09/04/2008 : 14:10:11
quote:
Originally posted by raghu

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.



Number 1 is a simple problem - what have done? Please share with us.

For #2

How many letters are ther in total - in BOOKKEEPER

How 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...


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