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Option B is the answer of your question.
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area of trapezium= 1/2*sumof parallel sides*distance between them
let parallel sides be 3x and 5x
384=1/2（3x+5x）*12
384=1/2*8x*12
384*2=1*8x*12
384*2/8*12=x
768/96=x
x=8cm
let parallel sides be 3x and 5x
384=1/2（3x+5x）*12
384=1/2*8x*12
384*2=1*8x*12
384*2/8*12=x
768/96=x
x=8cm
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