Numeracy test: A company is running a campaign to reward its customers over a certain number of days. Every day the total amount of each order is added to a list. Each day a random customer wins the difference between the largest and smallest order in the entire list, and these orders are removed from the list. Find the total cost of running this campaign. The input: first line gives number of days campaign runs, and first number of each following line is the number of orders that day. All other numbers are order values. Example: 5 2 07 01 3 10 05 01 1 01 0 4 03 01 12 11 Expected result: 6+9+4+0+11=30

Mathematical reasoning test: You have two ropes and a lighter. Each rope has the following property: If you light one end of the rope, it will take one hour to burn to the other end. They don't necessarily burn at a uniform rate. How can you measure a period of 45 minutes? And 15 minutes?