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18 February, 22:19

A stack of thirty cards is placed next to a ruler, and the height of stack is measured to be 3 / 4 of an inch. How thick is one card?

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  1. 19 February, 00:56
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    You need to divide 3/4 inches by 30 cards.

    Using the reciprocal rule,

    (3/4) / 30 = (3/4) * (1/30)

    Multiplying fractions,

    (3/4) * (1/30) = 3/120 = 1/40 inches.
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