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21 April, 13:19

She needs to build a line of dominoes 21 and 1/4 in a long with each domino spaced 1 and 1/4 in. apart. How many will she need?

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  1. 21 April, 14:01
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    17 dominoes

    Step-by-step explanation:

    21 and 1/4 in divided by how far they need to be spaced apart, 1 and 1/4 in, is equal to 17 dominoes.
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