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Let x be the number of advance tickets.
Then the number of same-day tickets is (40-x), OBVIOUSLY.
Next, you write the total money equation
35x + 30*(40-x) = 1325 (total money).
It is your basic equation for this problem.
As soon as you understand on how to get it and how to write it, the setup is complete and you are a winner.
The rest is just a technique.
To solve the equation, simplify it
35x + 1200 - 30x = 1325
35x - 30x = 1325 - 1200
5x = 125
x = 125/5 = 25.
ANSWER. 25 advanced tickets and (40-25) = 15 same-day tickets.
CHECK. 25*35 + 15*30 = 1325, total money. ! Precisely correct !
The problem is just solved.
Please let me know if everything is clear to you in my solution.
Do not hesitate to ask questions, if you have some.
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It is a standard and typical tickets problem.
There are different methods of solving such problems.
In this site, there is a lesson
- Using systems of equations to solve problems on tickets
explaining and showing all basic methods of solving such problems.
From these lessons, learn on how to solve such problems once and for all.
Also, you have this free of charge online textbook in ALGEBRA-I in this site
- ALGEBRA-I - YOUR ONLINE TEXTBOOK.
The referred lesson is the part of this online textbook under the topic "Systems of two linear equations in two unknowns".
Save the link to this online textbook together with its description
Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson
to your archive and use it when it is needed.
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In studying word problems, the major thing is to learn it from a good source.
Please do not forget to post your "THANKS" to me for my teaching.