Question 207617
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You did  just fine with setting up the equation:

{{{(a-b)1545=3(a^2-b^2)}}}

Then you factor the parentheses on the right:

{{{(a-b)1545=3(a-b)(a+b)}}}

You can divide both sides by {{{a-b)}}} because
since you are told that a and b are two unequal
numbers, a-b is not 0, so you can divide by it:

{{{((a-b)1545)/(a-b)=(3(a-b)(a+b))/(a-b)}}}

{{{((cross(a-b))1545)/(cross(a-b))=(3(cross(a-b))(a+b))/(cross(a-b))}}} 

{{{1545=3(a+b)}}}

Divide through by {{{3}}}

{{{1545/3=3(a+b)/3}}}

{{{515=(cross(3)(a+b))/cross(3)}}}

{{{515=a+b}}}  

So you don't know what a and b are, and there is 
no way to find out. However that doesn't matter 
because you already have their sum, a+b, which 
is 515 pairs of jeans.

Edwin</pre>