<p>Ok, I looked at [Area</a> problem using counting](<a href=“Math Forums | Math Help Forum”>Math Forums | Math Help Forum) and sort of understood the answer.</p>
<p>I’m guessing the shelter must be along the edges of the interior space (40x130). Combining the answer and the other guy’s response, I’m also assuming you move the shelter down by 10 feet (not 1 like the other guy indicated). Perhaps they got this number from the 10 foot boundary around the park dimensions? I’m not sure. But that’s the only way to get 22.</p>
<p>Personally, I would assume that there would be 10 x 100 ways, because I would think that the shelter could be anywhere within the 40 x 130 space.</p>