SOLUTION: A photograph measures 20 cm by 16 cm. A strip of constant width is to be cut off the top and one side of the photo, so the area is reduced to 60% of the area of the original photo.

Question 260314: A photograph measures 20 cm by 16 cm. A strip of constant width is to be cut off the top and one side of the photo, so the area is reduced to 60% of the area of the original photo. Find the width of the cut.
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
The original area is 20x 16 = 320
The new area is to be 320*.60 = 192
we get

By foil, we get

setting = 0 we get

x = 32 cm
or
x = 4 cm.
x = 4 cm is our answer.
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