mO/mMg = 4/3
4 + 3 = 7
3g---------7g
x-----------210g
x= 210g*3g/7g = 90g
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mO/mMg = 4/3
4 + 3 = 7
3g---------7g
x-----------210g
x= 210g*3g/7g = 90g