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a) 4/5 – 1/2 = (8 – 5)/10 = 3/10

So, 3/10 of container stores 840cm³ of water.

4/5 of container stores (4/5)(10/3)840 = 2240 cm³ of water #

 

b) Tank leaking water at 40 cm³ per minute when container has 2240 cm³ of water.

So, it will take 2240/40 = 56 minutes for the tank to empty. #

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