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we have to divide the amounts given in the problem
[tex]\begin{gathered} 7\frac{1}{2}=\frac{15}{2} \\ 1\frac{1}{2}=\frac{3}{2} \end{gathered}[/tex]so we have
[tex]\frac{\frac{15}{2}}{\frac{3}{2}}=\frac{15}{2}\cdot\frac{2}{3}=5[/tex]It will last 5 days