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3 May, 18:27

Willy and Billy each have a rock collection. • The number of rocks in Willy's collection can be represented by x. • The number of rocks in Billy's collection is 2 2 3 times the number in Willy's collection. • The total number of rocks in both collections is 110. What is x, the number of rocks in Willy's collection?

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  1. 3 May, 18:48
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    There are 30 rocks in Willy's collection.

    Since the number of rocks in Willy's collection is x, the number in Billy's collection is (2 2/3) x or 8/3x.

    x + (2 2/3) x = 110

    (3 2/3) x=110

    11/3x = 110

    Dividing both sides by 11/3,

    (11/3x) : 11/3 = 110:11/3

    x = 110:11/3 = 110/1 : 11/3 = 110/1 * 3/11 = 330/11 = 30
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