Some months have 30 days, some have 31, but how many have 28 days?

If a hen and a half will lay an egg and a half in a day and a half, how many eggs would six hens lay at the same rate in six days?

How can you throw a ball such that it comes back? No bounces are involved!

In which sport do winners move backwards and losers move forwards?

If a collection of cows and crows has 43 heads and 120 feet, how many of each are there?