When Tom was 2 years old his sister was half his age. Now, Tom is 100 years old. Then how old is his sister?
Riddle AnswerMath Riddles
Binoculars and Case Cost $100
When purchased together, a pair of binoculars and the case cost $100. If the binoculars cost $90 more than the case, how much does the case cost?
Riddle AnswerCookie Problem
In a cookie jar, there are ten butter cookies and ten chocolate-chip cookies. Tom sneaks over to the cookie jar in the middle of the night and tries to figure out:
- How many cookies do I need to take out of the jar if I want to make sure to get at least two of each kind?
- How many cookies do I need to take out of the jar if I want to make sure to get at least two butter cookies?
Romantic Candlelight Dinner
A man lights two candles and begins a romantic candlelight dinner with his wife. The candles are of equal length, but one candle is thicker than the other.
The thick candle is designed to last for 6 hours while the thin candle is designed to last for 3 hours.
At the end of the dinner, the thick candle is twice as long as the thin candle. How long did the dinner last?
Riddle AnswerProbability of Picking 2 Black Socks
There was a blind man. He had four socks in his drawer that were either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.
Can you find out the probability of picking 2 black socks?
Riddle Answer