Question 1188238
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The simplest way to solve such problems is a  BACKWARD  method,


when you  MENTALLY  start from the end and move to the beginning,


making inverse operations to the described,  step by step.



Doing this way,  the problem can be solved in your head mentally,  with  NO  equations.



Pen or pencil together with piece of paper are good assistants.



Many problems of this kind are designed,  created and intended  SPECIALLY  for you 

to learn and apply this method,  and this given problem is  ESPECIALLY  GOOD  for you to start with.



See the lesson 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/equations/Solving-problems-on-the-remaining-amount.lesson>Solving problems on the remaining amount</A> 

in this site and find there several similar solved problems.


Start reading this lesson from the very beginning.



Happy learning &nbsp;(&nbsp;!&nbsp;)