Ram spends 20% of his monthly income on his household needs, 15% of the remaining income on books and 30% of the remaining income on clothes. Now he has Rs 9520 left, so what is his monthly income?

The difference between the interior and exterior angles at a vertex of a regular polygon is 150°. The number of sides of the polygon is

The weight of a bucket full of water is 36 kg. If the weight of a half-filled bucket is 21 kg, what will be the weight of the empty bucket?

Rajesh can do a work in 6 days and Vikram can do the same work in 5 days. The contract for the work is of Rs. 3300 . How much shall Vikram get if both of them work together?

A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h. Find the speed (in km/h) of the boat in still water.  

If  $$ \ {xy\over x+y}= a, $$ $${xz\over x+z}=b $$ and $$ {yz\over y+z} =c $$  where a, b, c are all non – zero numbers, then x equals to

180 m long Train A crosses Train B of 120 m in length which is running in opposite direction in $$ {60\over 11}$$ sec. If speed of train B is 20% more than that of train A, then find the time taken by both trains to cross each other, when they running in same direction?