A fruit seller had some apples. He sells 40% apples and still has 420 apples. How many apples he originally had?

Suppose originally he had x apples.

Then, (100 - 40)% of x = 420.

He originally had 700 apples.

Suppose originally he had x apples.

Then, (100 - 40)% of x = 420.

He originally had 700 apples.