general Maths Puzzle

How can you arrange 10 balls along five lines, each line containing exactly 4 balls?

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general Other Question

A man has two bankcards, each with a 4 digit number. The first number is 4 times the second. The first number is the reverse of the second. Find the numbers. A farmer challenges an engineer, a physicist, and a mathematician to fence off the large amount of area using the least amount of fence. The engineer made his fence in a circle and said it was most efficient. The physicist made a long line and said that the length was infinite. Then he said that fencing half of the Earth was the best. The mathematician laughed at the others and with his design, beat the others. What did he do?