Math Scale Drawings HW

On a map the scale is 1/2 inch: 25 miles. What's the actual distance between two cities that are 3 inches apart? So, for this question I don't even know where to start!!! PLZ HELP ME!!!!!

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asked by Petrice
  1. One way to solve this problem is with a proportion. Let's use decimals: 1/2 inch = 0.5 inches

    0.5/25 = 3/x

    Cross multiply.

    0.5x = 75

    Solve for x.

    x = 75 / 0.5

    x = 150 miles

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