JEE Advanced 2020 Concept Recapitulation Test 2 Paper 2

In a sonometer wire, When the tension is maintained by suspending a 20kg mass from the free end of the wire, the fundamental frequency of vibration is 300Hz. If the tension is provided by two masses of 5kg and 15kg suspended form a pulley (massless and friction less) as shown in the figure, if the fundamental frequency will approximately n65Hz then find the value of 'n'