Question 1177888
.
<pre>

Use the formula  n = {{{(6 - 1.20m)/0.6}}},


where m is the number of a deluxe package of superhero cards and n is the bunmer of storybooks.


Vary m from the set  m= 0, 1, 2, . . . until the formula will produce non-negative numbers.


Create the respective table of numbers m and n.


By doing this way, you will obtain the answer to your question.
</pre>

Solved, answered, instructed, explained and completed.