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the food fair for the grade 6 pupils is intended to raise funds for the poor. grade 6-a sold 200 cakes less tgan grade 6-b. grade 6-c sokd half as many as grade 6-a. grade 6-d sold 50 cakes less than grade 6-c. grade 6-d sold 300 cakes. how many did grade 6-a sell?​