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

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

What does below chemistry rebus means?

Can you make four (4) nines (9) equal 100?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

Solve the rebus below.

O_er_t_o_

Complete the missing letters of the given word.