When measuring distance 12 beads are Approxmately equal to 6 erasers. How many erasers are equal to 18 beads? How many beads equal to 42 erasers?

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  1. use a simple ratio

    for the first:

    12/6 = 18/x
    12x = 108
    x = 9

    repeat for the second part


    simply realize that one eraser is twice as long as a bead, so ....

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