Question 1123771
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Let x be the number of the $20 dollars bills.

Then the number of the $10 dollars bills is (x+2), according to the condition.


The money equation is


    20x + 10*(x+2) = 410


Simplify and solve for x.  


    20x + 10x + 20 = 410

    30x = 410-20 = 390  ====>  x = {{{390/30}}} = 13.


<U>Answer</U>.  13 of the $20-dollars bills and 13+2 = 15  of the $10-dollars bills.


<U>Check</U>.   20*13 + 10*15 = 410 dollars.   ! Correct !
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