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Y=MANZANA
Z=PERAS
X+Y+Z=12
X=2Y
Y=3Z ....3Z=Y-->Z=Y/3
X+Y+Z=12
2Y+Y+Y/3=12
(6Y+3Y+Y/3)=12
10Y=36
Y=3.6 EUROS
X=2Y
X=2(3.6)
X=7.2 EUROS
Z=Y/3
Z=3.6/3
Z=1.2 EUROS
COMPROBAMOS
X+Y+Z=12
7.2+3.6+1.2=12
12=12