When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Can you find the missing piece of the Porsche?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

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

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?