In a college Anjana scored 80 marks out of 150 in History and 95 marks out of 120 in English. If she wants to score 70% marks in 3 subjects, find the minimum marks she should score in Geography out of 100.

If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is : 

A shopkeeper earns a profit of 25 percent on selling a radio at 15 percent discount on the Printed price. Finds the ratio of the Printed price and the cost price of the radio.

5.52 – 2.3² + 0.8³ × 0.12 ÷ 0.4⁴ – 3.14 =?

If $$ {3^{4x-y}={3^{x+y}=\sqrt{27}}}$$,  then the value of y is:

By increasing the radius of a sphere by 50 percent, how much will the area of its surface increase?

While travelling downstream, a man can row 16 km more in 4 hours as compared to travelling upstream. What is the speed of the stream?