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July 22, 2014

July 22, 2014

Posted by **Anonymous** on Sunday, February 20, 2011 at 11:12pm.

(a) An economics and/or a mathematics course?

(b) Exactly one of these two courses?

(c) Neither an economics course nor a mathematics course?

- Mathematics -
**MattsRiceBowl**, Monday, February 21, 2011 at 12:15amSo out of 500 students, we know what 671 of them are doing. I think there are many unregistered freshman taking classes at that college. ...

The numbers do not add up.

- Mathematics -
**MattsRiceBowl**, Monday, February 21, 2011 at 12:25amI may have read this wrong, of course. After reading it again, I thought differently.

There are 153 students taking both economics and math. That means there are:

205 - 153 = 52

There are 52 students only taking math, but not economics.

313-153 = 160

So 160 students are taking economics without math.

So out of 500, we have:

160 only taking economics.

52 only taking math.

153 taking both.

That is 365 out of 500 taking at least one of the classes. How many aren't taking math or economics?

Now, it's just a matter of percentages.

- Mathematics -
**Adithya**, Friday, February 21, 2014 at 11:02amHalf of a third of x equals a fourth of y plus a fifth of y. If x = 27, what is the value of y?

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