Does anyone know what is maths DQ test?

In Carton A, 1/5 of the 900 fruits were mangoes and the rest were pears.In carton B, 60% of the 600 fruits were mangoes.

after some of the fruits in both cartons had switched cartons, 3/10 of the fruits in carton A and 48% of those in carton B were mangoes.How many fruits were left in Carton A in the end?

Need help

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