$24+24\div2-4=32$ 
In Bill\textquotesingle s class, every student can play either piano, or violin, or both. $24$ of his classmates can play piano, and the number of students that can play violin is half of that of playing piano. If there are $4$ students who can play both, how many students are there in the class? 

1: $$68$$ 
2: $$20$$ 
3: $$38$$ 
4: $$34$$ 
5: $$32$$ 