Question

The ratio of weights of hydrogen and magnesium deposited by the

Answer 1

Your question seems to be incomplete but I would like to tell you that in order to get the ratio of any substance deposited, you need to determine the amount of that substance in question.

So mostly in the determination of the amount of substance deposited if often covered in quantitative electrochemistry.

So to determine the ratio of hydrogen to magnesium deposited in this case you will need to get the average of the two amounts and this will give you the ratio.