Question 378064
$10 bill -------x
$20 bill -------y
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x+y=20......................1
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10+20y=330
/10
x+2y=33.....................2
multiply equation 1 by -1
-x-y-20
add this to (2)
-x+x-y+2y=-20+33
y = 13 $ 20 bills
x= 7 $10 bills
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