book Maths Puzzle Numerical Ability

How do I solve the equation 42 divided by z=7?

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can you tell me how to get numbers 40-60 by using only four nines? you can not use any other number. you may use any mathmatical operation(addition,sutaction,multiplication,divisio 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?