book Maths Puzzle Numerical Ability

5psquared - no () P=2
do you work from left to right? OR square first? HELP

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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 Jill walked at a constant rate for 2 hours and then ran twice that rate for 1/2 an hour. She traveled 18 km in all. What was her walking rate?