What four weights can be used to balance from 1 to 30 pounds?

If eleven plus two equals one, what does nine plus five equal?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I am quite hot but become too cold if you remove the first two letters. What am I?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

I can be cracked, made, told, and played. What am I?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

What does below Rebus say?

XLR8