Mrs. Neo has two packets of flour. The ratio of the mass of flour in Packet A to the mass of flour in Packet B is 1:2. Mrs. Neo uses ⅓ of the flour in Packet A and has 800 grams left altogether. How much flour is there in Packet B?

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  1. 2/3 A = 800
    A = 1200
    A:B = 1:2 = 1200:2400

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