What is the fastest way to double your money?

Replace the question mark with the correct number in the below-given picture?

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

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

A dying old man wants to divide his entire land between his only two sons. Since his only wish is to treat them as equal as both of them have been too good to him, he wants to divide his land equally between them. The problem is that the land is significantly irregular in shape and thus there is no choice of cutting them into two equal halves.

Can you help him divide the land in a manner that both of his sons will be happy?

Find out the number of circles in the given picture having Illusion

Can it be possible to build a house that has all its four walls facing towards the South?

With the help clues provided in the image, can you find the 5 digit key?