Problems/The average of all numbers/task.html

<b>The average of all numbers</b> <a class=right href="https://hyperskill.org/learn/step/6071">Open on JetBrains Academy</a>
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  <p>Write the code that reads 2 numbers from the keyboard, <em>a</em> and <em>b</em>. As an output, it shows the mean of all numbers that lie on the interval between <em>a</em> and <em>b,</em> and can be divided by 3. </p> 
  <p>What does it mean? In the example, you are to calculate the mean of the numbers in the range <span class="math-tex">\( [-5; 12] \)</span></p> 
  <p>The numbers divided by 3 without the remainder are: <span class="math-tex">\( -3, 0, 3, 6, 9, 12 \)</span>. There are six of them, and the mean is 4.5.</p> 
  <p>The input interval always contains at least one dividend of 3. Remember to include the values of <em>a</em> and <em>b</em> in your calculations.</p>
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</html><br><b>Sample Input:</b><br>-5<br>12<br><b>Sample Output:</b><br>4.5<br><br><br><font color="gray">Memory limit: 256 MB</font><br><font color="gray">Time limit: 5 seconds</font><br><br>
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