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So we can consider the pool is in a shape of a cuboid + a half cuboid with same dimension 

so total volume = 3/2V = 3/2 x 40 x 1.5 x 15 = 1350 m³ = 1350000 L  (1 m³ = 1000 L)
2 5 2
any question plz ask
How did we convert m³ in L?
And yeah it helped a lot though.
1 m3 = 1000 L
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