Can you spot the hidden girl in the picture below?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

What part of the chicken has the most feathers?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Find the next number in the series below

21 32 54 87 131 ?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

How do you go from 98 to 720 using just one letter?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?