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125 gallons of a mixture contains 20% water. what amount of additional water should be added such that water content is raised to 25%?

\frac{15}{2} g a l l o n s

\frac{17}{2} g a l l o n s

\frac{19}{2} g a l l o n s

\frac{25}{3} g a l l o n s

ANS : 4

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