Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

What is the next number?

77, 49, 36, 18 ?

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 ?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

Find out the missing number in the picture attached:

I have feet, but no legs. Which animal Am I?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?