exam Maths Puzzle Numerical Ability

find the number of sides (N) in a regular convex polygon with the exterioe angles measuring 120*(degrees)?

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I did not reliaze it but there is a second part to the question so I am resubmitted it all at this time. the questions is
The solutions of line a are (3, 3), (5, 5), (15, 15), (3 Coffee powder costing $12.75 per kg is mixed with coffee powder costing $8.95 per kg in the ratio 5:7 by weight. The mixture sold at $12 per kg. Find the gain percent.