Two metallic oxides contain 27.6% and 30% oxygen respectively

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Problem

Two metallic oxides contain 27.6% and 30% oxygen respectively. If the formula of the first oxide is

X_3O_4

, the formula of the second oxide will be (1)

XO

(2)

XO_2

(3)

X_2O_3

(4)

X_2O_5