ANSWER
7.5
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How i got it?
<u><em>We can use our scale 3:10 and the actual distance of 25 km to find the number of centimeters.</em></u>
<u><em>If the kilometers are 2.5 times as long, then we also need to multiply the centimeters by 2.5</em></u>
<u><em>3 x 2.5 = 7.5</em></u>
<u><em>The number of centimeters on the map that represents an actual distance of 25 kilometers is 7.5, centimeters.</em></u>
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