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A fruit stall initially had 330 more apples than mangoes.
The fruit vendor sold 160 mangoes, and at the same time added 160 apples to the existing stock of apples.
Eventually, the ratio of the number of apples to the number of mangoes became 9 : 4.
(a) How many apples were there at first?
(b) How many mangoes were there at first?
Notes to student: