Physics Question from JEE Main 2023 · 13 April, Shift 2

In an experiment with a sonometer, when a mass of $180 \, \text{g}$ is attached to the string, it vibrates with a fundamental frequency of $30 \, \text{Hz}$. When a mass $m$ is attached, the string vibrates with a fundamental frequency of $50 \, \text{Hz}$. The value of $m$ is _____ $\text{g}$.