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

What number should come in place of the question mark below?

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

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

What has 13 hearts but no other organs?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?