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    <p>Here's your problem:</p> <pre><code>person_array = Array.new(number_of_people, Person) </code></pre> <p>In short, don't make array like this. Use the <code>[]</code> literal syntax. What this returns is:</p> <pre><code>[Person, Person, Person] </code></pre> <p>That is 3 references to the <code>Person</code> class, not instances. Then later you do:</p> <pre><code>person_array.push(Person.new(iq, speed, power, beauty)) </code></pre> <p>And you end up with:</p> <pre><code>[Person, Person, Person, person_instance] </code></pre> <p>So when you iterate through and call <code>send_for_beer</code> on that first item, it does have that method because <code>send_for_beer</code> is an instance method that you are calling erroneously on a class object.</p> <p>The fix here is to simply assign <code>person_array</code> to an empty array literal, and then push things to it.</p> <pre><code>person_array = [] </code></pre> <hr> <p>And a minor style note: <code>&lt;&lt;</code> is usually preferred to <code>Array#push</code>, making the filling of the array look more like this.</p> <pre><code>person_array &lt;&lt; Person.new(iq, speed, power, beauty) </code></pre> <hr> <p>Ruby also support implicit return of the last expression in a method. So you do not need to <code>return result</code>. Instead, simply calulate the return value as the only line in the method.</p> <pre><code>def send_for_beer @iq * 2 + @speed * 10 + @power * 5 + @beauty end </code></pre> <hr> <p>Instance variables don't quite work like that either. When you have <code>@name</code> in the class body directly, you are not initializing instance variables for each instance. You are actually setting instance variable on the class object (which is weird, I know). What you actually need to do is set them from any instance method, typically <code>initialize</code>, which you are doing here. So you can totally remove the instance variable setting at the class level here.</p>
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