Question
A fruit seller has a certain number of apples of which
10% are rotten. He sells 91% of the remainder and then 405 apples are left. How many apples he bought?Solution
Let's denote the total number of apples as x. Rotten apples= 0.1x  Good apples= 0.9x Apples sold (91% of good apples) 0.91 x 0.9x =0.8192 Apples left= 0.9x - 0.819x = 0.081x  ATQ- 0.081x = 405 x = 405/0.081 =5000 The fruit seller originally bought 5000 apples.
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