Question 1143848
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Let x be his saving in November (exactly the unknown value).


Then his saving in December was 0.5x, according to the condition.


Thus his November salary is 1600 + x dollars;

     his December salary is 1600*1.3 + 0.5x  dollars.


The salary is the same -- it gives you an equation


    1600 + x = 2080 + 0.5x


Simplify and solve it :


    x - 0.5x = 2080 - 1600

    0.5x     = 480

    x = {{{480/0/5)}}} = 960.


<U>ANSWER</U>.  His November saving was 960 dollars.
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You can solve the problem &nbsp;MENTALLY, &nbsp;too, &nbsp;i.e. without using equation/equations.



<pre>
He increased his spending by 1600*0.3 = 480 dollars, and, therefore (or due to it), he decreased his saving in half.


Hence, half of his saving in November is exactly 480 dollars -- thus his saving on November was 2*480 = 960 dollars.


You get the same result.
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