Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

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

Do you know what I am?

Which is the correct shadow of the bird?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

Can you find out who is the kidnapper in below Picture and why, Explain ?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Can you solve this picture maths equation?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?