book Maths Puzzle Numerical Ability

The width of a rectangle is 4 feet less than the length. The area is 320ft^2. Find the width of the rectangle.
___feet
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book Other Question

Four Ladiess are waiting to cross a bridge at night. They can only cross the bridge 2 at a time and they must carry a lantern over and back or they will not be able to see. Lady A Hi there,

I don't get this problem with extraneous solutions! Could someone please help me work out this problem before class?
x-3/5 = x-3/x

Thank you
AC