In a fruit stall, there were total of 420 fruits.

Out of all these fruits, 60% of them were mangoes and the rest were apples.

`1/8` of the apples were red apples and the rest were green apples.

When a certain number of green apples were sold, the percentage of the mangoes in the stall increased to 70%.

(a) How many green apples were sold?

(b) How many more green apples than red apples were there in the stall in the end?

Notes to student:

1. If the question above has parts(e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12