The length of a rectangle is three times its width.If the width were increased by 4 and the length remained the same the resulting rectangle would have an area of 231 square inches.Find the dimensions of the original rectangle

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We are told that L=3W.

The area of a rectangle is Length times width.

The width is increased by 4, so we have W+4

The area is then L(W+4)=231

But, L=3W:

3W(W+4)=231

Solve the quadratic.