Q 1230156912.     A simple containing only `CaCO_3` and ` MgCO_3` is ignited to `CaO` and `MgO` . The mixture of oxides produced weight exactly half as much as the original sample . calculate the mass `%` of `CaCO_3` and `MgCO_3` on the sample

A

`x = 25%` & `y= 75%`

B

`x = 30%` & `y= 70%`

C

`x = 28.4%` & `y= 71.6%`

D

None of these

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