`Pb_3O_4` is regrded as a compound oxide of `PbO` and `PbO_2`. How many part of ` PbO_2` are present in it ?

Pb_(3)O_(4) is regarded as a compound oxide of PbO and PbO_(2) . How many parts of PbO_(2) , are present in it?

PbO_(2) is:

PbO_(2) is:

PbO_2 is :

PbO_2 is obtained from