Volume of tank = 216 litres = 216 d m3
Let the length of the tank be x dm, then
Depth = x/3 dm and breadth = 1/6 of(x “ x/3)dm
=(1/6 x 2x/3)d m = x/9 d m
X × x/9 × x =216
=> x3 = 216 x 27 = 63 x 33
=> x =(6 x 3) = 18 d m
Hence length of the tank = 18 dm
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