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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.

A cricket chirps faster when the weather is warmer. The number of chirps per minute is approximately 7 times the temperature (in degrees Celsius) and then take 20°C. How fast would it chirp if the temperature was 30°C? What would the temperature need to be for it to chirp at 150 chirps per minute?

Answer: 190, about 24