Respuesta :

Let the unknown number be x

x% of 108 = 81

[tex]\begin{gathered} \frac{x}{100}\text{ }\times108\text{ = 81} \\ \frac{108x}{100}\text{ = 81} \\ 1.08x\text{ = 81} \\ x\text{ =}\frac{81}{1.08}\text{ =75} \end{gathered}[/tex]

Thus 75% of 108 is 81

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