You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.
In this picture you can see 6 coins in the shape of a cross. Moving just ONE coin, can you form 2 lines, each with 4 coins?
You have three houses or squares drawn on paper and below them three smaller squares representing gas, water, and electric. Can you draw a line and get each utility into every house (9) total lines, without crossing over any line?