I am white when I am dirty, and black when I am clean. What am I?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

Make a sentence consisting of three words that have the whole alphabet.

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

What has 13 hearts but no other organs?

Can you replace the question mark with the correct number?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.