Five numbers added together in pairs produce: 0, 2, 4, 4, 6, 8, 9, 11, 13, 15 What are the five numbers?
Weekly Problem 16 - 2012
Weekly Problem 47 - 2013
If p is a positive integer and q is a negative integer, which of the following is the greatest?
E. More information needed
If you liked this question, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.