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A log is cut into 4 pieces in 12 seconds. At the same rate how long would it take to cut the log into 5 pieces?
HINT: the answer is not 15

  • math -

    We make 3 cuts to get 4 pieces.
    We must make 4 cuts to get 5 pieces.
    Set up a proportion.
    (3cuts/12 s) = (4 cuts/? s)
    Cross multiply
    3cuts * ?seconds = 48
    ? sec = 48/3 = 16 seconds.
    Check my thinking. Check my work.

  • math -

    To cut the log into 4 pieces takes 3 cuts. Each cut averages 4 seconds.

    To cut the log into 5 pieces takes 4 cuts. How long do you think it will take to make 4 cuts?

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