You may solve the simple probability, “Given a set of n randomly chosen people, what is the probability of two people having same birthday?” You may also solve, “At least how many people need to be picked to make the probability 100% that at least two of them have same birthday?” Answer to the second question is […]

A person rides a cycle at a constant speed. When he drives in the direction of the wind, he is able to go 35 km in 5 hrs. While returning, when the wind was against the direction of his driving, he took 7hrs for the same distance. At what speed does he rides when there is no wind?

There are 50 bikes, each with a tank that has the capacity to go 100 kms (when the fuel is full). Fuel tanks of all the bikes are full. Using these 50 bikes, what is the maximum distance that you can go?

Earlier we discussed, how to calculate total number of squares (of all sizes) on the chess board. Here, the problem is, How many rectangles (of any size) will be there on the chess board?

At a party, everyone shook hands with everybody else. There were 66 handshakes. How many people were there at the party?

Two towns are exactly 100 km apart. Suresh leaves City-A at 3 pm driving at 30 km/hr. After 30 minutes, at 3:30 pm, Ramesh leaves City-B driving at 60 km/hr. When they meat each other, how far they will be from City-A ?

A man can do a piece of work in 60 hours. If he takes his son with him and both of them work together, then the work is finished in 40 hours. How long will the son take to do the same job, if he worked alone on the job?

Two friends decided to get together and start riding bikes towards each other, both at a speed of 6 km/hr (starting at the same time). The live 36 km apart and hence will meet halfway. One of them have a pet pigeon and it starts flying the instant the friends start traveling. The pigeon flies […]

If the digits of my present age are reversed then I get current age of my son. If one year ago my age was twice the age of my son. Find my present age.

If the base of a Right angled triangle is increased 4 times and height is reduced to half, what will be the effect on its area ?