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8 August, 12:43

Hevesh wants to make 2 lines of dominoes that are both 21 inches long. Each line has dominoes spaced 1 and 1/2 inches apart. How many dominoes will she need for both lines?

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  1. 8 August, 13:12
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    Answer: 30 dominoes in total.

    Step-by-step explanation:

    Each line is 21 inches long.

    the space between dominoes is 1 + 1/2 inches.

    (assuming that the distance includes the domino itself) Now, we need at least two dominoes to see this distance,

    The we have N + 1 dominoes per line, and the distance is:

    N * (1 + 1/2) inches = 21 inches

    If we find N, we can find the number of domineoes in each line:

    N = 21 / (1 + 1/2) = 14

    This means that we have 14 + 1 = 15 dominoes in each line, and we have two lines, so we have 30 dominoes in total.
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