Today Puzzle #774
Puzzle No. 774鈥� Thursday 2 July
In a pile of 200 coins, 2% are gold coins and the rest are silver. Simon removes one silver coin every day until the pile contains 20% gold coins. How many silver coins does Simon remove?
Today’s #PuzzleForToday has been set by Senior Kangaroo mathematics competition, run in the UK by the UK Mathematics Trust.
Click here for the answer
180
The number of gold coins in the original pile is 0.02 x 200 = 4. These form 20% of the final pile. Therefore there are 4 x 5 = 20 coins left. Hence the number of silver coins Simone removes is 200 – 2- =180
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