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( 20 + 8 x 0.5 ) / ( 20 -? ) = 12

Correct Answer: 18

Explanation:

Let (20 + 8 x 0.5) / ( 20 - y) =12
Then, 24 =12 x (20 - y)
∴ 12y = 216
⇒ y = 18


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