What is black when you buy it, red when you use it, and gray when you throw it away?

Can you solve this picture maths equation?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

Which is faster, Heat or Cold ? Explain.

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

What's the only room from which no one can enter or leave

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Which is Odd One Out and why?

4377

3954

9862

8454

9831