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21 February, 06:28

Bobby has a bag containing 2 sizes of marbles. The big ones weigh 10 g and the small ones weigh 3 g. If there are three times as many small ones as big ones and the bag weighs 209 g, how many big marbles does he have?

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  1. 21 February, 08:20
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    There are 19 big marbles

    Step-by-step explanation:

    10a + 3b = 209

    a = 3b

    3b = 3b

    10a + a = 209

    11a = 209

    a = 209/11

    a = 19
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