The ratio of the masses of methane and ethane in a gas mixture is `4:5`. The rate of number of their molecules in the mixture is

The ratio of the masses of methane and ethane in a gas mixture is `4:5`. The rate of number of their molecules in the mixture is:
A. `4:5`
B. `3:2`
C. `2:3`
D. `5:4`

The ratio of the masses of methane and ethane in a gas mixture is `4:5`. The rate of number of their molecules in the mixture is:

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