book Maths Puzzle Numerical Ability

What is the answer for this..
(6+4)+3=3+n

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book Other Question

The problem is dealing with a regular hexagon(17), and I believe a regular triangle inscribed in a circle(18). You are givin the diameter(#17 is 12 and #18 is 16) You are asked to find the coefficient matrix and evaluate its determinant
3x-5y=7
2x+4y=-6