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Why are 2024 UK pound coins worth more than 2023 UK pound coins?

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I travelled from London to Glasgow last week at 60 miles per hour, I had filled my petrol tank just before I left, so it was full with 25 gallons.

Unfortunately, my petrol tank sprang a leak immediately, and I only managed to drive 300 miles before I ran out of petrol.

My car does 30 miles per gallon, how fast was I losing petrol through the hole?

Puzzle Copyright © Kevin Stone

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What is the 10^th prime number?

2, 3, 5, 7, …

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all matchstick puzzles

Can you make this equation correct by moving exactly one matchstick?



Note: this puzzle is not interactive, and the matchsticks cannot be moved. The matchstick layouts for each digit are:

Puzzle Copyright © Kevin Stone

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