By decreasing $15°$ of each angle of a triangle, the ratios of their angles are $2 : 3 : 5$. The radian measure of greatest angle is:

A river $3 m$ deep and $40 m$ wide is flowing at the rate of $2 km/hr$. How much water (in litres) will fall into the sea in a minute?

If the difference of two numbers is $3$ and the difference of their squares is $39$, then the larger number is: 

The price of an article was first increased by $10\%$ and then again by $20\%$. If the last increased price be Rs. $33$, the original price was:

If the price of sugar is raised by $25\%$, find by how much percent a householder must reduce his consumption of sugar so that there is no increase in the expenditure of sugar?

A certain sum will amount to Rs.$12,100$ in $2$ years at $10\%$ per annum of compound interest, interest being compounded annually. The sum is: