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Thread: Scale Drawing

  1. MHB Apprentice

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    #1
    QS) A model of a bus has a scale of 4cm to 3m. The model is 10cm long. What is the real length of the bus?

    my workout: 4cm to 3m. 4 cm is length of model and 3m is real length.
    so we have, mode = 10 cm long

    so 4 cm to 10 cm: 10/4= 2.5 cm

    for real length 3 X 2.5= 7.5 m.

    I am not sure about my ans. Do i need to convert cm to m? Please anyone give better explanation. Thank you.

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  3. MHB Journeyman
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    #2
    $\dfrac{3 \, m}{4 \, cm} = \dfrac{x}{10 \, cm}$

    $x = \dfrac{(3 \, m)(10 \, \cancel{cm})}{4 \, \cancel{cm}} = 7.5 \, m$

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