The average of the first and the second of three numbers is 15 more than the average of the second and the third of these numbers. What is the difference between the first and the third of these three numbers?

30 pens and 75 pencils altogether were purchased for Tk.510. If the average price of a pencil was Tk.2, what w...

A boat travel with a speed of 10 km/hr in still water. If the speed of the stream is 3 km/hr then find time ta...

The ratio of the speed of boat in still water to the speed of stream is 16 :5. A boat goes 16.5 km in 45 minut...

A train passes a platform in 40 sec and a woman standing on the platform in 30 sec. If the speed of the train...

A train 125 m long passes a person, running at 8 km/hr in the same direction in which the train is going in 25...

There are two numbers, 1 number is 12 more than the 2"d number. The average of the two numbers is 19. If 2 is...