SOLUTION: The ratio of the perimeter of a rectangle to its longest side is 10 : 3. The perimeter is 40cm. What is the length of the longest side?

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Question 618389: The ratio of the perimeter of a rectangle to its longest side is 10 : 3. The perimeter is 40cm. What is the length of the longest side?
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

The ratio of the perimeter of a rectangle to its longest side is 10 : 3.

The perimeter is 40cm. What is the lengthx of the longest side?

  10%2F3+=+40cm%2Fx  ||Cross Multiplying to solve

     10x = 120cm

       x = 120cm/10 = 12cm