Question 249009
A print is 10 cm longer than it is wide. It is mounted in a frame 1.5cm wide. The area of the frame is 399cm^2. Find the dimensions of the print

Let x be the width of the print.
The length then is x+10.

The width of the frame is x+1.5 and the length is (x+10)+1.5 = x+11.5

Since the area of the frame is length times width we have:

(x+1.5)*(x+11.5) = 399

Solve this equation for x (width) and then calculate the length x+10.