Why is 6 afraid of 7?

Forwards I am heavy, backward I am not. What am I?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

Find the next number in the sequence

5 12 24 36 ?

During which month do people sleep the least?

what does this below rebus represent identXQQQQQME

What does this rebus riddle means ?

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

What four weights can be used to balance from 1 to 30 pounds?