Question 1165935
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Let x be the number of the $16 frames.

Then the number of the $4 frames is 20-x.


Next you write the total money equation

    16x + 4*(20-x) = 152.


Then you simplify this equation and find


    x = {{{(152 - 4*20)/(16-4)}}} = 6.


<U>ANSWER</U>.  6 frames at $16 and the rest 20-6 = 14 frames at $4.
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Solved.