Congratulations! You found your 90 coconuts and set off on your raft to be rescued. Unfortunately, your raft made of drift wood sank 10 meters off the shore! You dragged your coconuts back onto the beach and decided to build a raft out of bamboo instead.
You have lots of bamboo which is 10 cm in diameter. Each meter of bamboo can support 5 kg of weight. But each meter of bamboo also weighs 1 kg. How many meters of bamboo should you use to support your weight of 80 kg? How much should you use to support one-and-a-half times your weight—just to be on the safe side so you don't sink again?
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