Question 1199606
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White chocolate cost $20.00 per bar, and dark chocolate cost $25.00 per bar. 
If Anne bought 15 bars of chocolate for $340.00, how many bars of dark chocolate did she buy?
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Let x be the number of dark chocolate bars Anne bought.

Then the number of the white chocolate bars is 15-x.


Write the total money equation

    25x + 20*(15-x) = 340  dollars.


Simplify and find x

    25x + 300 - 20x = 340

    25x - 20x = 340 - 300

        5x    =     40

         x    =     40/5 = 8


<U>ANSWER</U>.  Anne bought 8 dark chocolate bars.


<U>CHECK</U>.  25*8 + 20*(15-8) = 200 + 140= 340 dollars, total.  ! Correct !
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Solved.