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$50
∧
30 1210 $50= 32*20-1210 -570
----------------- = ------ =19
∨ 20-50 -30
$20
$20 32*50-1210 390
= ----------------- = ------ =13
50-20 30
De : $50 = 19 billetes (mayor en 6 billetes )
$20 =13 billetes