A certain oxide of iron contains 2.5 gra...

A certain oxide of iron contains 2.5 grams of oxide for every 7.0grams of iron. If it is regarded as a mixture of FeO and `Fe_(2)O_(3)` in the weight ratio a:b, what is a:b ? (atomic weight of iron = 56)

`9:10`

`9:20`

`14:5`

`1:1`

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