Question 1120159
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This problem is a typical example to solve using &nbsp;<U>ONE &nbsp;UNKNOWN</U>&nbsp; and &nbsp;<U>ONE EQUATION</U>, &nbsp;as the tutor &nbsp;@MathTherapy did.



The way &nbsp;@gosgarithmetic &nbsp;uses is the way to nowhere.


I do not recommend you to follow his approach.


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If you want to see other similar problem solved with one equation and one unknown, &nbsp;look into the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/equations/Advanced-word-problems-to-solve-by-reduction-to-single-linear-equation.lesson>Advanced word problems to solve using a single linear equation</A>

in this site.