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This is a Simultaneous equation question.

     R1      R2   R2 – R1  
Length  1 2 1  
Height 2 2 0  
Total    20 32 12  

1u = 12 (length)

20 – 12 = 8

8 ÷ 2 = 4 (height)

a)

12 × 12 × 2 = 288

4 × 12 × 4 = 192

288 + 192 = 480 cm2

b)

20 × 20 × 4 = 1600 cm3

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Volume should be 12 x 12 x 4 = 576 cm3

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