Math algebra

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the scale on aroad map indicates that 1/4 inch equals 20 miles. How far apart in miles are two towns that are 3 1/2 inches away on the map.

  • Math algebra -

    How many fourths are in 3 1/2? Ans:14

    So the distance must be 14*20

  • Math algebra -

    The answer in my book is 280. I can not figure out how to write the equation using proportiions using cross multiply. I have tried several ways and unable to get the answer in the book.

  • Math algebra -

    0.25 / 20 = 3.5 / x

    Cross multiply:

    0.25x = 70
    x = 280

  • Math algebra -

    Thank you !

  • Math algebra -

    3.5" x (20 miles/0.25") = ??
    Check my work.

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