Glenn cuts half a rectangular lawn, 40 m by 30 m, by mowing strips of equal width around the perimeter. Brad cuts the small rectangle left. How wide a strip does Glenn cut so that they share the work equally?
Do you mean "how can I look at this an immediately know the answer without having to think about it or do any calculation? I can't help you there because I certainly couldn't do that myself!
Have you at least drawn a picture? Do you know any formulas for area?
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