What number should come in place of the question mark below?

When it is alive we sing, when it is dead we clap our hands. What is it?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What is at the end of a rainbow?

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?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

It is always ahead of me yet I can never see it. What is it?