Question 36955
Hello!
Let's call X to the number of AM radios produced, and Y to the number of AM/FM radios produced. Since X takes 15 hours to produce, and Y takes 20 hours, then total number of hours needed for the whole production must be:

{{{15X + 20Y}}}

Since total production time can't exceed 300 hours, we get the inequality:
{{{15X + 20Y <= 300}}}

Also, no more than 18 radios can be produced:
{{{X + Y <= 18}}}

Finally, we must produce at least 4 AM radios (X) and at least 3 AM/FM radios (Y). So we get:
{{{X >= 4}}}
{{{Y >= 3}}}


I hope this helps!
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