People put me on the table and cut me but do not eat me. What am I?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

If six children and two dogs were under an umbrella, how come none of them got wet?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

What is at the end of a rainbow?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?