Ram scored $30 \%$ marks and failed by $15$ marks. Aditya scored $40 \%$ marks and obtained $35$ marks more than those required to pass. What is the pass percentage (in $\%$)?

An ore contains $23 \%$ copper. To get $69 \text{ kg}$ of copper, the quantity of the ore required is: (in $\text{ kg}$)

Of the $1000$ inhabitants of a town,$60 \%$ are males of whom $20 \%$ are literate. If,of all the inhabitants,$25 \%$ are literate,then what per cent of the females of the town are literate (in $.5$)?

Pradeep invested $20\%$ more than Mohit. Mohit invested $10\%$ less than Raghu. If the total sum of their investment is $₹ 17,880$,how much amount did Raghu invest?

An empty fuel tank of a car was filled with an ordinary type of petrol. When the tank was one-third empty,it was filled with high-speed petrol. Again,when the tank was one-third empty,it was filled with an ordinary type of petrol. Again,when the tank was one-third empty,it was filled with high-speed petrol. At this time,what was the percentage of high-speed petrol in the tank?

Aditya's salary is $80\%$ of Amit's salary and $120\%$ of Rajiv's salary. What is Amit's salary if Rajiv's salary is $30,000$ (in $,000$)?