Question 1164263
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Let x be the number of the A-type tickets.


Then the number of the B-type tickets is 3x, as stated.


Finally, the number of the C-type tickets is  (23000 - x - 3x) = (23000-4x).


Then the money equation (=the revenue equation) is


    75x + 55*(3x) + 30*(23000-4x) = 870000.


Thus I reduced the original problem to one single equation in one unknown.


I leave it to you to solve it.


When you find x from the equation, you will be in position to answer the problem's question.
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At this point, I completed my instructions.


The rest is on you.



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The major lesson for you from my post is to learn &nbsp;HOW &nbsp;I reduced the original problem to a single equation in one unknown.



At this point, &nbsp;I open to accept your &nbsp;"DEEPEST &nbsp;THANKS" &nbsp;for my teaching, &nbsp;and &nbsp;I &nbsp;expect to get it &nbsp;SOON.