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

A sundial has the fewest moving parts of any timepiece. Which has the most?

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Why do we preferably have round manhole covers and not square ones?

Different lights make me strange by changing me into different sizes. What am I?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

81 x 9 = 801. What must you do to make the this equation true?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?