Question 1174035
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Let x be the number of printing presses of type A.

Then the number of other presses is  (14-x).


Now you write the equation for total printed books per day


    70x + 55*(14-x) = 905  books.


I will not explain, how to write this equation and why I wrote it in this form -simply because it is ABSOLUTELY CLEAR.


From the equation


    x = {{{(905 - 55*14)/(70-55)}}} = 9.


<U>ANSWER</U>.  There are 9 printing presses of type A and 14-9 = 5 printing presses of type B.
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Solved.


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Is everything clear to you in my solution ?