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tank is in the form of a cuboid with length 12m. If 18 kilolitre of water is removed from it, the water level goes down by 30 cm. What is the width (in m ) of the tank ?
एक टंकी घनाभ के आकार की है जिसकी लंबाई 12 मी है | यदि इससे 18 किलोलीटर पानी निकाल दिया जाए, तो जल स्तर 30 सेमी नीचे चला जाता है | टंकी की चौड़ाई ( मीटर में ) कितनी है ?

A

4

B

5

C

5.5

D

4.5

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