What's the smallest number of birds that could fly in this formation: 2 birds in front of a bird, 2 birds behind a bird, and a bird between two birds?
If your bedroom were pitch dark and you needed a pair of matching socks, how many socks would you need to take out of the drawer if there are only 10 white socks and 10 red ones?
How many birthdays does the average person have?
Mr. and Mrs. Sniglet have five children. Half of them are boys. How is this possible?
The doctor gave you 3 pills and said to take 1 every half hour. How long would the pills last?