Find measure of central angle of the arc whose length is 22 cm and radius of the circle is 28 cm?

A train 200 m long running at 36 kmph takes 55 seconds to cross a bridge. Length of the bridge is

Suresh is half his father’s age. After 20 years, his father’s age will be one and a half times Suresh’s age. What is his father’s age now?

The ratio of the age of a son and father is 1: 4. After 9 years, the ratio will be 2: 5. What is the present age (in years) of the son?

What will come in place of question mark(?) in the following number series?
10, 14, 25, 55, 140 (?)

A dealer bought an item at 10% discount on its original price. He sold it  at 35 % more than the original price. What percentage profit did he get?

The area bounded by the lines x = 0, y = 0, x + y = 1, 2x + 3y = 6 (in square units) is 

30 dozen walnuts were purchased for Rs. 14400 and 32 packets of walnuts (20 walnuts in each packet) were purchased for Rs. 57600. If a packet of Akharato was sold for five rupees in a pack at Rs. 432, what would be the profit percentage?