12. 9+ {20 – 3 of 5 + (20 + 40 – 25 ÷ 5)}
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9 + {20 - 3 of 5 + ( 20 + 40 - 25 / 5 ) }
=> 9 + 20 - 3 × 5 + ( 20 + 40 - 25 / 5 )
=> 9 + 20 - 3 × 5 + ( 20 + 40 - 5 )
=> 9 + 20 - 15 + ( 20 + 40 - 5 )
=> 29 - 15 + ( 60 - 5 )
=> 14 + ( 55)
=> 14 + 55
=> 69 >>> Answer
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