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March 2, 2015

March 2, 2015

Posted by **Lisa** on Tuesday, April 15, 2008 at 2:25pm.

The choices are:

36

100

136

180

316

I think the answer is either 180 or 316, but I'm not sure.

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**Reiny**, Tuesday, April 15, 2008 at 2:43pmDo it with Venn diagrams

draw two intersecting circles, label the overlap as x

This will represent the people owning both cats and dogs

label one circle D for dogs, the other C for cats

label the part of circle D without the overlap as 316-x

label the part of the circle C without the overlap 280-x

now 316-x + x + 280-x = 416

x = 180

so the dog owners owning "no cat" would be those in the D circle outside the overlap or 316-x = 316-180 = 136

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**Lisa**, Tuesday, April 15, 2008 at 2:50pmThank you.

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**marlene**, Tuesday, April 15, 2008 at 7:41pmhow do you round

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**PsyDAG**, Wednesday, April 16, 2008 at 2:00pmFirst, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.

Even so, I searched Google under the key words "*rounding number rules*" to get these possible sources:

http://math.about.com/od/arithmetic/a/Rounding.htm

(Broken Link Removed)

(Broken Link Removed)

http://en.wikipedia.org/wiki/Rounding

http://www.math.com/school/subject1/lessons/S1U1L3DP.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps. Thanks for asking.

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