A fruit-sellerhad some apple he sells 40% of them and still has 420 appels find the nummber of appels he had originally

A fruit-seller had some apples he sells 40% of them and still has 420 apples. How many apples had he in all ?

A shopkeeper has certain number of apples of which 10% are found to tbe rotten. He sels 85% of the remaining good apples and still has 405 good apples. How may apples did he originally have?

A fruit seller has a certain number of mangoes of which 5% are rotten. He sells 75% of the remainder and he is left with 95 mangoes. How many mangoes did he have originally ?

A fruit seller bought 6 dozen apples at the rate of Rs 750 per dozen.He found that 6 apples had to be thrown away as they were rotten.At what rate per apple does he need to sell the rest to make 10% profit?