Never gamble with your gold #1

Baral, an unusually large pnome, was going home for the day. He had just received his month’s pay. The gold coins jingled in his pocket as he walked down the road. He stopped for a short rest beneath a large beech tree. There he met a strange looking pnome with, of all things, hair on his head.

The strange pnome had heard the jingle of gold coins and wanted them. He challenged Baral to answer a riddle, "Solve this riddle and you will win twice your gold."

Baral agreed and the strange looking pnome whispered the riddle into Baral's ear. Baral thought and thought but he could not solve the riddle. The strange pnome took all of Baral's gold and was about to leave when Baral said, "Double or nothing."

The strange pnome was greedy so he gave Baral a chance, "Solve two problems correctly and you will get back your gold. Solve them not and you will lose all the gold you have hidden at home." Baral was desperate so he said, "What are the two problems?"

The strange pnome scratched a 2 x 5 grid in the dirt and replied, "Place the numbers 1, 3, 5, 7, 9, 11, 13, 15, 17, 19 in the grid, one number in each square, so that the sum of the two numbers in each of the five columns is always 20."

Baral worked long on the first problem.