If the masses of `Mn` of `O` are in the ratio of `55 : 16` in `MnO`, what is the ratio of `O` that combines with the same mass of `Mn` in `MnO_(2)` and `Mn_(2) O_(7)` ?

Explanation

To solve the problem, we need to determine the ratio of oxygen that combines with the same mass of manganese (Mn) in the compounds MnO2 and Mn2O7, given that the mass ratio of Mn to O in MnO is 55:16.

### Step-by-Step Solution:

1. **Identify the mass of Mn in MnO:**
- In MnO, the mass of Mn is given as 55 g and the mass of O is 16 g. This means for every 55 g of Mn, there is 16 g of O.

2. **Calculate the mass of O in MnO2:**
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