A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had:
Suppose originally he had $ x $ apples.
Then, (100 - 40)% of $ x $ = 420.
$\Rightarrow \dfrac{60}{100} \times x $ = 420
$\Rightarrow x $ =$ \left(\dfrac{420 \times 100}{60} \right) $ = 700.
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