exam Maths Puzzle Numerical Ability

How do I calculate the sum of the Interior angles of a convex 18-gon

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exam Other Question

The Nys had eight grandchildren in 2002. In 2003, they had 12 grandchildren. Find the percent increase in the number of grandchildren from 2002 to 2003. 1. 2.
5x+2y-z=-7 x-2y-3z=-1
x-2y+2z=0 2x+y+z=6
3y+z=17 x+3y-2z=13

3. 4. x+3y+z=0
x+y+z=6 x+y-z=0
2x-yz+z=3 x-2y-4z=0
3x-z=0