If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

I am white when I am dirty, and black when I am clean. What am I?

When it is alive we sing, when it is dead we clap our hands. What is it?

What is the centre of gravity?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

When we see 2 but call 10?

Why blonde cannot dial 911?

Find the next number in the series.
1 10 24 43 67 ?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.