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Two glasses together contain 280 mLof water. The first glass contains 80 ml more than the second glass. How much water does the first glass contain?

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x - 1st glassy - 2nd glass[tex]x+y=280\\
x=y+80\\\\
y+80+y=280\\
2y=200\\
y=100\hbox{ ml}\\\\
x=100+80\\
x=180\hbox{ ml}[/tex]

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