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).
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?
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.
Interactive Math Goodies Software
couple of problems I need help with
Posted - 09/04/2008 : 13:09:32
