Question : A man bought some eggs of which 10% are rotten. He gives 80% of the remaining to his neighbours. Now he is left out with 36 eggs. How many eggs did he buy?
Option 1: 40
Option 2: 100
Option 3: 200
Option 4: 72
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Correct Answer: 200
Solution : Let the number of eggs he bought be 100 units. Eggs, after removing rotten one = 90 units Eggs given to neighbour = 80% of 90 = 72 units. Now, remaining eggs = 90 - 72 = 18 units. Now, on comparing, we get, 18 units = 36 1 unit = $\frac{36}{18}$ 100 units = $\frac{36}{18}$×100 = 200. So, he bought 200 eggs. Hence, the correct answer is 200.
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