The volume of rain water in the land which could have been collected and the volume of water in the tank should be equal . Let, level of water in the tank is h meter. According to the question, ⇒ 5/100 × 1800 × 1800 × 160/300 = 240 × 10 × h ⇒ h = 36 m Volume of water in the tank = 240m × 10m × 36m = 86400 m3 Since, water in the tank is 75% of its capacity. So, capacity of tank = (86400/75) × 100 = 115200 m3
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