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Step-by-step explanation:
Volume of water in cylindrical tank πr^2 h
Diameter 4.2 m radius = 2.1 m
22/7×2.1×2.1×10.5=145.53
Volume of cuboidal tank = lbh
=9×7×h=145.53
=63×h=145.53
h=145.53/63=2.31m
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