Help on this kinda question?

Question

4. One year 37 students sat an examination in physics, 48 sat chemistry and 45 sat biology. 15 students sat physics and chemistry. 13 sat chemistry and biology, 7 sat physics and biology and 5 students sat all three.

a) Draw a venn diagram to represent this information.

b) Calculate n (PUCUB).

^ ^ The U isnt actually a u it stands for something else!

BTW at the end of the question some of these numbers will come up 20 for physics 25 for chemistry and 30 for biology i have no idea where these numbers come from.

Answer 1

read this website. it shows a similar problem. Just put your numbers into it.

http://mathforum.org/library/drmath/view...