SSC MTS 5 Aug 2019 Shift 2 Paper

Number of boys = 4/5 × 150 = 120
⇒ Number of girls = 1/5 × 150 = 30
⇒ Mean proportional between the number of boys and girls = √( Number of boys × Number of girls)
⇒ Mean proportional between the number of boys and girls = √(120 × 30 = 60
∴ Mean proportional between the number of boys and girls is 60.