A rectangular tank measuring 32 cm by 12 cm by 20 cm was empty at first. There were 3 identical bottles which were completely filled with water. Mr Kim poured all the water from the 3 bottles into the tank. In the end, the tank was 1/5 filled with water. How much more water was needed to fill the tank to the brim? (2 marks)
Answer: 6144 cm³
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total volume of tank → 32 x 12 x 20 = 7680 cm³ = 7.68 litres
"In the end, the tank was 1/5 filled with water."
1/5 filled → 1/5 x 7.68 litres = 1.536 litres
water to fill to the brim → 7.68 - 1.536 = 6.144 litres = 6144 cm³