exam Maths Puzzle Numerical Ability

The following pie chart represents the eye color of students in a certain class.
other=17% blue = 33% brown = 50%

If there were 82 students in the class, how many students had brown eyes?

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exam Other Question

If you have 2 inequalities such as
y>7
6x-y<-1

how do you know where do shade on a graph for those inequalities, and how do you find the exact intersection point?
what set of numbers do:

pi
0
-35
-31.8

belong to a piece?