Question

A map has a scale of 1 inch to 15 miles . If 2 cities are 3.4 inches apart on the map , what is the actual distance between the 2 cities ?

Answer 1

Look at it this way. (x.y x = 10 / y = 1) So, 3 inches straight is 15 * 3 = 45, and the 0.4 would be 45 + 4 = 49. So, 49 should be your answer.

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Answer 2

$\bf \begin{array}{ccll} \stackrel{inch}{map}&\stackrel{mile}{actual}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 1&15\\ 3.4&x \end{array}\implies \cfrac{1}{3.4}=\cfrac{15}{x}\implies x=\cfrac{3.4\cdot 15}{1}$