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Puzzles & Brain Teasers
Gold Coins
After pausing a moment, he replied, "Well! If I divide the coins into two unequal numbers, then 69 times the difference between the two numbers equals the difference between the squares of the two numbers."
The wife looked puzzled. Can you help the merchant's wife by finding out how many gold coins they have?
69
Solution:
The merchant has 69 gold coins.
It is easy to check this... Let's divide the 69 coins into two unequal numbers, say, 64 and 5. Then,
69 (64 − 5) = (64 × 64) − (5 × 5).
Food for thought:
Note that the 69 coins can be divided into any two unequal numbers, a and b, not necessarily 64 and 5, so long as a + b = 69. Isn't that interesting?
The above problem is solved in a straightforward manner if one knows the following formula:
a2 − b2 = (a + b) (a − b)
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