What is the fastest way to double your money?

Can you count the number of blocks in the picture below?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

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?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?