Question

At Micaela's Printing Company LLC there are two kinds of penting presses: Model A which can print 60 books per day and Model B which can print 30 books per day. The company owns 15 total printing presses and this allows them to print 600 books per day. How many of each type of press do they have?

Answer 1

A+B=15 —>A+15=B(plug this into the other equation)
60a+30b=600
60a+30(a+15)=600
60a+30a+150=600
90a+150=600
90a=450
A=5 (plug back in to first equation)
A+B=15
5+B=15
B=10

They have 5 of the Model A and 10 of model B.