book Maths Puzzle Numerical Ability

What is the foumula to find the sum of interior angles of any polygon?

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book Other Question

Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1 � hours. How quickly can all three fill the pool together How many arrangements of the letters in the word olive can you make if each arrangement must use three letters?