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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, ⇒ 6/100 × 2000 × 2000 × 140/300 = 200 × 10 × h ⇒ h = 56 m Volume of water in the tank = 200m × 10m × 56m = 112000 m3 Since, water in the tank is 70% of its capacity. So, capacity of tank = (112000/70) × 100 = 160000 m3
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