$A$ number is decreased by $10 \%$ and then increased by $10 \%$. The number so obtained is $10$ less than the original number. What was the original number?

In a company,there are $75\%$ skilled workers and the remaining are unskilled. $80\%$ of skilled workers and $20\%$ of unskilled workers are permanent. If the number of temporary workers is $126$,what is the total number of workers?

Nutan got $456$ marks in an exam. Aditya got $54 \%$ marks in the same exam,which is $24$ less than Nutan. The minimum passing marks in the exam is $35 \%$. How many marks did Nutan get more than the passing marks?

If $P \%$ of $P$ is $36,$ then $P$ is equal to

When the price of a product was decreased by $10 \%$,the number sold increased by $30 \%$. What was the effect on the total revenue (in $\%$)?

In an entrance examination,Ritu scored $56\%$ marks,Smita scored $92\%$ marks,and Rina scored $634$ marks. The maximum marks of the examination are $875$. What are the average marks scored by all the three girls together?