For the following questions answer them individually
Insert the missing character marked as '?'.
If $$+$$ means $$\div$$, $$\div$$ means $$-$$, $$-$$ means $$\times$$, $$\times$$ means $$+$$, then
$$10 + 5 \div 7 - 4 \times 30 = ?$$
Pointing to a man. Pankaj said. "He is the brother of my uncle's daughter". How is this man related to Pankaj?
In the English alphabets, which letter comes in the right middle of D and N ?
If @ means +, # means — , $ means x and * means ÷, then what is the value of 16 @ 4 $ 5 # 72 * 8 =