Question 360987
This same problem came up a few weeks ago. This is what I submitted then. Perhaps it will help you
 
A small firm produces both AM and AM/FM car radios. The AM radios take 15 h to produce, and the AM/FM radios take 20 h. The number of production hours is limited to 300 h per week. The plant's capacity is limited to a total of 18 radios per week, and existing orders require that at least 4 AM radios and at least 3 AM/FM radios be produced per week. Write a system of inequalities representing this situation. 
:
Let x = number of AM radios; let y = number of AM/FM radios
 
The production hour constraint:
15x + 20y =< 300
:
Plant's capacity constraint:
x + y =< 18
:
Min AM radio production constraint:
x => 4
Min AM/FM radio production constraint 
y => 3
:
How about this, did it all make some sense to you?