Can you calculate the probability of getting a sum of six when a dice is thrown twice?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

Why 1729 is a magic number? Answer Logically.

Decode this picture on T-Shirt and tell what it says ?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Solve the puzzle by telling what does below picture means.

Can you count the number of lines in the below picture?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?