The quality of each glass of water: $(700 - 300) \div (6 - 2) = 100$ g  At first: $300 - 100 \times 2 = 100$ g 
There is some water in a bowl, which is on a electronic scales. Mike pours water into the bowl. After pouring $2$ glasses of water, the sacle shows $300$ grams. After pouring a total of $6$ glasses of water, the scale shows $700$ grams. What is the quality of the water at the start? 
A) $$100$$ g 
B) $$150$$ g 
C) $$200$$ g 
D) $$250$$ g 
E) $$275$$ g 