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22 April, 12:19

Rachel used 12 cubes to make this 3-step staircase. if she uses a total of 42 cubes to make a similar staircase, how many steps will the staircase have? think of usiing objects to solve this problem

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  1. 22 April, 15:11
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    12 / 3 = 42 / x ... 12 cubes to 3 steps = 42 cubes to x steps

    cross multiply

    (12) (x) = (42) (3)

    12x = 126

    x = 126/12

    x = 10.5 steps
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