Let the required number be x.
According to the given condition,
[tex]\begin{gathered} 60\text{ \% of x = 30} \\ \frac{60}{100}\times x^{\text{ }}\text{ = 30} \\ 60x\text{ = 3000} \end{gathered}[/tex]Simplifying further,
[tex]\begin{gathered} x\text{ = }\frac{3000}{60} \\ x\text{ = 50} \end{gathered}[/tex]Thus the required number is 50.