Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?