A rectangular tank measures 30cm by 15 cm by 20 cm. It contains water to a depth of 15 cm. How many metal cubes of edge 5 cm need to be placed in the water to raise the water level to the brim of the tank?

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  1. (30*15*20 - 30*15*15)/5^3 = 18

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  2. 70

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  3. 90cm 70cm 1m tank have contain howmany litters of water

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