exam Maths Puzzle Numerical Ability

I am trying to help my daughter with homework. Since it has been many years I have forgotten how to do. How to i anwer this ...Seperate $89 into two parts so that the second part is $4less than twice the first part.

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A theater has 30 rows of seat, the first row has 10 seats and each row thereafter has 1 more seat than the previous row. How many seat are in the theater and what is the equation? The second of three numbers is 4 times the first. THe third number is one more than the second. The sum of the numbers is 73. FInd the numbers