What is the next number in the sequence?
1
11
21
1211
111221
312211
13112221
Math Riddles
End of the World on a Sunday
If the end of the world should come on the first day of a new century, can you say what are the chances that it will happen on a Sunday?
Riddle Answer100 Using 4 Sevens
Can you take 4 7’s and arrange them with any math symbols needed to make the total be 100?
Riddle AnswerThe Two Aeroplanes
A man recently bought two aeroplanes, but afterwards found that they would not answer the purpose for which he wanted them. So he sold them for $600 each, making a loss of 20 percent on one machine and a profit of 20 percent on the other. Did he make a profit on the whole transaction, or a loss? And how much?
Riddle Answer