Can you solve a math problem?

Question

Of the 67 students studying a foreign language at Green Hills High School, 24 are studying Spanish, 24 are studying French, and 28 are studying German. There are 6 students studying Spanish and French, 4 studying French and German, 7 studying German and Spanish, and 3 studying all three languages. How many students are not studying any of these three languages?

Answer 1

Use a Venn diagram with three circles partially overlapping. Begin by placing the number 3 in that area which is common to all three circles. Then use subtraction to compute what number goes into the rest of these three regions:

intersection of Spanish & French

intersection of French & German

intersection of Spanish and German.

Get the idea?  Consult examples like this that there must be in your class textbook and/or lecture notes, etc.