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In a company, there are 100 people, will drive 83 people, will swim 75 people, not drive, and swim 1

844,594,0392010-01-26 23:01:54 +0000 #1

Pride And Prejudice 6112010-01-26 23:18:22 +0000 #2
83 +75- (100-10) = 68

a total of 100 people, two are not there are 10 people. At least one of there 90. Assume that everyone will be kind, then it should be 158. More than 90 of that part is the will of the two kinds.
hsz888hsz2010-01-26 23:24:15 +0000 #3
driving and swimming will also set the number of x:

only people who drive 83-x

only swimmer is 75-x

different from those who are not all together is equal to 10

100

formula: (83-x) + (75-x) + x +10 = 100

x = 68

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