SOLUTION: A picture measures 40 cm by 30 cm. The outside perimeter of the frame around the picture is 156. Find the width of the frame.

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Question 678845: A picture measures 40 cm by 30 cm. The outside perimeter of the frame around the picture is 156. Find the width of the frame.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A picture measures 40 cm by 30 cm. The outside perimeter of the frame around the picture is 156. Find the width of the frame.
:
Let x = the width of the frame
The frame will add 2x to the dimensions of the picture, therefore:
:
The perimeter
2(2x+40) + 2(2x+30) = 156
divide eq by 2
2x+40 + 2x+30 = 78
4x + 70 = 78
4x = 78 - 70
4x = 8
x = 2 cm is width of the frame