75% of a number when added to 75 is equal to the number. The number is:
What is the compound interest on Rs. 2500 for 2 years at rate of interest 4% per annum?
Consider a right–angled triangle with inradius 2 cm and circumradius of 7 cm. What is the area of the triangle?
Find the sum of the following series:
9 + 99 + 999 + ... up to 10 terms.
From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings?
The amount of water that should be added to reduce a 9 ml lotion containing 50% alcohol to a lotion containing 30% alcohol is
The present worth of a certain bill due sometime in the future is Rs. 600, and the true discount is Rs. 36. The banker's discount is:
A sum of money doubles itself at compound interest in 17 years. In how many years will it become eight times the original amount?
If the speed of a boat in still water is 2 km/h and the speed of the boat upstream is 0.5 km/h, what is the speed of the stream?
A train of 24 carriages, each 60 meters long, is running at a speed of 60 km/h. The train also has an engine that is 60 meters long. How long will it take the train to cross a 1.5 km long bridge?