20%=0.2
2/5=0.4
X=Cantidad original
X-(0.2X). - (X-(0.2X)) *0.4=72
0.8X-(0.8X*0.4)=72
0.8X-0.32X=72
X=150
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20%=0.2
2/5=0.4
X=Cantidad original
X-(0.2X). - (X-(0.2X)) *0.4=72
0.8X-(0.8X*0.4)=72
0.8X-0.32X=72
X=150