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The cross-section of a canal is trape...

The cross-section of a canal is trapezium in shape. The canal is 12 m wide at the top and 8 m wide at the bottom. If the area of the cross-section is 840 sq. m, the depth of the canal is (a) 8.75 m        (b) 42 m          (c) 63 m        (d) 84 m

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