Question

x= log (100/12,5)/log2

Answer 1

$x = \frac{ log( \frac{100}{12.5} ) }{ log(2) } \\ x = \frac{ log( \frac{200}{25} ) }{ log(2) } \\ x = \frac{ log(8) }{ log(2) } \\ x = \frac{ log( {2}^{3} ) }{ log(2) } \\ x = \frac{3 \times log(2) }{ log(2) } \\ x = 3$