A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had:
588 apples
600 apples
672 apples
700 apples
Explanation:
Suppose originally he had x apples. Then, (100 - 40)% of x = 420. 60/100 $\times$ x = 420, x = (420 $\times$ 100/60) = 700