CAT (QA) PYQs

If among $200$ students, $105$ like pizza and $134$ like burger, then the number of students who like only burger can possibly be

In a class of $100$ students, $73$ like coffee, $80$ like tea and $52$ like lemonade. It may be possible that some students do not like any of these three drinks. Then the difference between the maximum and minimum possible number of students who like all the three drinks is

For two sets $A$ and $B$, let $A \Delta B$ denote the set of elements which belong to $A$ or $B$ but not both. If $P=\{1,2,3,4\}, Q=\{2,3,5,6\},, R=\{1,3,7,8,9\}, S=$ $\{2,4,9,10\}$, then the number of elements in $(P \Delta Q) \Delta(R \Delta S)$ is