book Maths Puzzle Numerical Ability

How many angles does a octagon has?

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book Other Question

I have had so many quizzes on this lesson, and I still don't uderstand them.please help. The ratio of students to teachers in a school is 18.5 to 1. If there are 1369 students in the school, how many teachers are there?

I know how to do proportions but I have no ide