A rectangular lawn is 60meters by 80meters. A part of the lawn is torn out to install a pool, leaving a strip of lawn of uniform width around the pool. The area of the poolnis 1/6 of the old lawn area. How wide is the strip of lawn?

Answer 1

If the strip has width w, the pool is

60-2w by 80-2w

So,

(60-2w)(80-2w) = 1/6 (60)(80)

Now just solve for w.