In an examination,$A$ got $25\%$ marks more than $B$,$B$ got $10\%$ less than $C$,and $C$ got $25\%$ more than $D$. If $D$ got $320$ marks out of $500$,the marks obtained by $A$ were:

The price of an article was first increased by $10 \%$ and then again by $20 \%$. If the final increased price is $₹ 33$,what was the original price?

If $30 \%$ students failed in English,$45 \%$ failed in Math,and $25 \%$ failed in both,then what is the percentage of students who passed in both subjects (in $\%$)?

Evaluate $28 \%$ of $450 + 45 \%$ of $280$.

If $18 \%$ of a number is $720,$ then what is $81 \%$ of the same number?

In a college election between two candidates,one candidate got $55 \%$ of the total valid votes. $15 \%$ of the votes were invalid. If the total votes were $15,200$,what is the number of valid votes the other candidate got?