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

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

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.

What word does this rebus represent?

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A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

In the picture given below, can you find out which digit will take place of the question mark?

How can you take 2 from 5 and leave 4?

What has a ring but no finger?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

What seven-letter word has hundreds of letters in it?