The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

You can hear me, but you can't touch or see me.

What am I?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What is the next number in the series?

15 29 56 108 208 ?

What has hands, but can’t clap?