A vertical stick 12 cm long casts a shadow 8 cm long on the ground. At the same time, a tower casts a shadow 40 m long on the ground. The height of the tower is 

Directions:  The table given below presents the number of books on different subjects kept on separate shelves subjects with odd and even numbers are of arts and Science respectively

Find the ratio of S1: S7.

What will come in place of the question mark (?) in each of the following series?

 15     12    17  10     ?    8    21     6 

Vipin swims in a 72 meter long pond. He travels 144 meters in one minute by swimming from one end to the other and coming back the same way, find his average speed.

If a manufacturer gains 10 percent, wholesaler 15 percent and retailer 25 percent, then the production cost of an article, whose retail price is Rs. 1,265, is 

A shopkeeper sold his goods at half the list price and thus lost 20 %. If he had sold on the listed price, his gain percentage would be 

Denominator of a rational number exceeds its numerator by 8. If 17 is added to the numerator and 1 is subtracted from denominator we get the rational number 3/2 then the rational number is

Train A which is 320 m long can cross a pole in 16 seconds. If it halts 5 times each time for exactly 18 minutes, how many hours will it take to cover a distance of 576 km? (in hours)