Question

QUICK PLS

Judy has two types of printing presses. Model A press prints 70 books daily and Model B press prints 45 books daily.
Judy has 10 presses and prints 650 books a day. Enter how many Model A presses Judy has.

Answer 1

Suppose they have a, b of Model A and B

Then

a + b = 14

70a + 55b = 905

b = 14 - a

70a + 55 (14-a) = 905

70a + 770 - 55a = 905

15a + 770 = 905

15a = 135

a = 9

b = 14 - 9 = 5

So 8 Model A, 5 model B