Monday

September 15, 2014

September 15, 2014

Posted by **Sara** on Monday, September 30, 2013 at 1:54am.

- math -
**Jai**, Monday, September 30, 2013 at 2:44amBecause those students who have a sister probably have a brother also or vice versa. So it's like they are counted twice. So naturally the count would be greater than the actual number of students.

I'll give you an example. For instance, Marshall has 14 classmates.

5/7 of 14 = 10 students have a sister

1/2 of 14 = 7 students have a brother

3/14 of 14 = 3 students have no siblings

The total is 20 (greater than 14). But what if 6 out of 7 students with a brother have also a sister? Thus, in those 10 students with a sister, 6 of them have also a brother, and so 10 - 6 = 4, and only this 4 students have a sister alone.

To summarize again:

4 have a sister alone

6 have a sister & brother

1 has a brother alone (this is from 7 - 6)

3 have no siblings.

Adding them: 4 + 6 + 1 + 3 = 14 (which is equal to the actual)

Don't worry, it's not really a dumb question. Actually it's pretty tricky. :)

Hope this helps~ :3

**Answer this Question**

**Related Questions**

math - 5th grade math parent. This will sound dumb but.... 5/7 1/2 and 3/14. The...

5th grade math parent - Hi the problem reads.......give an example that shows ...

english - the question might sound dumb, but can anyone check to see if the ...

Math - 5th grade parent can you please show me how to break down 4 4/5 does it ...

5th grade math - Pete looked at the colors of the shoes worn by his classmates. ...

5th grade math - I reached into my pocket and found that I have only dimes and ...

math - Derivatives are usually not taught in 5th grade. That is what your ...

5th grade - i want to see if my answer is correct & that i am understanding this...

math - Rachel is curious about the number of pets that people own. She surveyed ...

5TH grade math - estimate each sum or differnce. 7.4 + 3.1+ 9.8 How do I do this...