Math/algebra

The scale on a map is 2 cm : 7km. If two cities are 12 cm apart on the map what is the actual distance in km between the two cities? " this is NOT a homework question" i don't understand any of this!

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  1. Use a proportion.

    2/7 = 12/x

    Cross multiply and solve for x.

    2x = 84
    x = 42 km

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