book Maths Puzzle Numerical Ability

can you please answer and explain step by step to this problem

12-[20-2(6 to the second power, divided by 3x2 to the second power)]

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book Other Question

find three consecutive odd integers such that the sum of the first three exceeds twice the fourth by 5. One poll reported that the approval rating of the job performance of the President of the United States was 63%. The poll was said to be accurate to within 3.8%. What is the range of actual approval ratings?