SOLUTION: If 70% use comany A and 60% use company B, how many use both? What is the equation to figure out the answer?

Question 698377: If 70% use comany A and 60% use company B, how many use both?
What is the equation to figure out the answer?

Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
You can't say for sure. Is a range.
If the same folks in the 60% are in the 70%, then as many as 60% can use both.
However, there are 30% of the folks that do NOT use A. If all of them use B, then there are only 30% that use both. So the range is
30% <= x <= 60%
make sense?
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