A fruit-seller had some apples. He sells 40% of them and still has 420 apples. Find the number of apples he had originally.

Assume that the fruit seller initially had 100 apples

He sell 40% of them = 40 apples

Left out apples = (100 – 40)

= 60

In initial amount of apples if 60 of them are remaining = 100

In initial amount of apples if 1 of them is remaining = 100/60

In initial amount of apples if 420 of them are remaining = (100/60) x 420

We get,

= 100 x 7

= 700

Hence, the fruit seller had 700 apples