Find :

45 is what percent of 54 ?

Let 45 be $x\%$ of 54

Hence,

$x\%$ of 54 = 45

⇒ $\dfrac{x}{100} \times 54 = 45$

⇒ $\dfrac{54x}{100} = 45$

⇒ $x = \dfrac{45 \times 100}{54}$

⇒ $x = \dfrac{4,500}{54}$

⇒ $x = \dfrac{250}{3}$

⇒ $x = 83\dfrac{1}{3}$

45 is $83\dfrac{1}{3}\%$ of 54.