The rectangular field is 112m long and 62m broad. A cubical tank of edge 6m is dug at each of the four corner of the field and the earth so removed is evenly spread on the remaining field. Find the rise in level.
A
11.74cm (approx.)
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B
12.72cm (approx.)
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C
17.28cm (approx.)
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D
19.75cm (approx.)
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Solution
The correct option is C17.28cm (approx.) Length of the rectangular field =112m Breadth of the field =62m Edge of the cubical tank =6m Volume of the cube =6×6×6=216m3 Volume of 4 cubical tanks =4×216m3=864m3
Thus, the length and breath is reduced by 6+6=12cm .
Thus, the new length l=112−12=100cm
and the new breath b=62−12=50cm Let rise in level =h ∴l×b×h=864 =>100×50×h=864 =>h=8645000 =>h=0.1728m