Calculus Help?
posted by Matt .
I have no idea where to start?
A survey of one thousand people found that 70% of the people have a
CD player, 85% have a telephone, and 45.2% have a computer. At
least how many people have all three objects?

There is not enough information
If A is "Cd player"
B is "having telephone"
C is "having computer", we have to use the formula
Number(A or B or C)= Number(A) + Number(B) + Number(C)  Number(A and B)  Number(A and C)  Number(B and C) + Number (A and B and C)
What you are asking for is Number (A and B and C)
Can you see which data is missing?
Also do we know of the 1000 people if there are some that don't have either phone, computer or CD?? 
answer is 2 btw
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