## How Long Has He Got Left?Math brain teasers require computations to solve.Quentin is a man who writes puzzle books. His editor gives him a task for his next book. He must produce 500 puzzles in the space of 80 days. He has created 300 puzzles already. However he has been working slower than normal, producing an average of 15 puzzles for every 4 days. How fast will Quentin have to work now to get the book finished on time?
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