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

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

81 x 9 = 801. What must you do to make the this equation true?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

What does this rebus picture identify?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

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

What has a bottom at the top?

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