Two pipe can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all  the three pipes are kept open, then the cistern will be filled in

The ratio of the areas of two isosceles triangles having the same vertical angle is 1 : 9.The ratio of their heights is -

A train of length 212 meter is running at 45 km/h. In what time (in seconds) will it cross a platform of length 188 meter?

Mohan bought 25 books for Rs. 2,000 and sold them at a profit equal to the selling price of 5 books. The selling price of 1 book is: 

Two numbers are in the ratio 3 : 4. Their L.C.M. is 84. The greater number is 

At each corner of a triangular field of sides 26m, 28m, and 30m, a cow is tethered by a rope of length 7m. the area unglazed by the cow? 

If the cost of 10 books is ₹250, then find the cost of 15 books.

In bag there are coins of 25 paisa, 50 paisa and 1 rupee in the ratio of 3 : 4 : 5. If there are in all Rs.31, then how many 1 rupee coins are there in the bag?