exam Maths Puzzle Numerical Ability

How many diagonals does a 30-sided polygon have?
How do you find a formula to solve this?

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exam Other Question

Joe Ravioli went running 3 days this week. He ran 21/2mi on Monda, 23/10mi on Wednesday, and 32/5mi on Friday. How far did he run altogether this week? There is a collection of snakes and iguanas. The reptiles have a total of 50 eyes and 56 feet. How many reptiles of each type do you have?