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Volume of water in container A = 8 x 12 x 11 = 1056 cm3

Surface area of A = 12 x 8 = 96

Surface area of B = 16 x 5  = 80

Height of water in both containers = 1056/ (96 + 80) = 6cm

Volume of water taken out from container A = 12 x 8 x 5 = 480 cm3

480 cm3  = 4800 mm3

 

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The problem is that most schools or teachers at the primary level will teach the students to remember that the formula for volume is (Length x Breath x Height). However, this is true only if the container is a cube or cuboid (rectangular).

Students should understand that the formula to calculate volume for regular shaped containers is (Base Area x Height). Length x Breath just so happens to be the formula to calculate the area for a rectangle.

This way, the (96 + 80) working by Orckids, which is the combined base area for both containers, would make more sense to students.

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