Did you draw a Venn diagram? If so, you should be able to see that
5 had only cake and hamburger
7 had only cake and milk
2 had only milk and hamburger
and so on. The only thing left to figure out is how many had nothing.
(14+37+20)-(5+10+8)+3 = 51
So 39 had nothing
what is the answer here 90 student went to the zoo, 3 had hamburger milk and cake; had 5 milk and hamburger; 10 had cake and milk; 8 had cake and hamburger; 14 had hamburger; 37 had cake; 20 had milk nothing.
1 answer