book Maths Puzzle Numerical Ability

How many 3 digit counting numbers are even?

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book Other Question

Reduce the following expression to lowest terms:

x^2 - 9x + 14/5x^2 - 20 How do i find the Exterior angle of a regular polygon with 15 sides
i have the choices
a)180
b)12
c)24
d)156
but i found the INTERIOR angle is 156 and then the
Exterior angle should be 204 right