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a=10 cm
At = 6 a^2 = 6 * 10^2= 600 cm2 ( area total).
si disminuye las aristas un 60% , tenemos las aristas = 4 cm
At= 6 *4^2 = 96 cm2
vamos a calcular cuanto disminuye:
600--------------100
96------------x
x= 9600/600=16
luego disminuye un 84 %