I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What does the below rebus puzzle mean?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

How many triangles can you find in this given picture?

You see me once in June, twice in November, and not at all in May. What am I?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?