45/50 - 75% =.....................

[tex] \frac{45}{50} - 75\% \\ = \frac{45}{50} - \frac{75}{100} \\ = \frac{90}{100} - \frac{75}{100} \\ = \frac{15}{100} \\ = \frac{3}{20} [/tex]

45/50-75/100=90/100-75/100=15/100:5/5=3/20