Posted by **Matt** on Monday, October 29, 2007 at 4:58pm.

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?

Is the answer 152?

- Calculus Check -
**bobpursley**, Monday, October 29, 2007 at 6:25pm
The minimum number will start with the 15 percent who do not have a telephone:

So 150 of 452 have a computer, but no telephone.

The next group has to be having a telephone and a computer, but not cd player.

300 do not have a cd player, so you can take these 300 and make them owners of a computer.

That leaves 2 people who have to have all three.

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