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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: