Question 594443
Printing press model A can print 70 books per day and model B can print 55 per day.
 If there are 14 total presses and together they print 905 books per day, how many books does each model print per day?
:
No. of presses equation
A + B = 14
B = (14-A); use this form for substitution
:
Output equation
70A + 55B = 905
Replace B with (14-A)
70A + 55(14-A) = 905
70A + 770 - 55A = 905
70A - 55A = 905 - 770
15A = 135
A = 135/15
A = 9 presses
:
You can find the number of B presses, Check the solutions in the output equation