book Maths Puzzle Numerical Ability

how many sides does a regular polygon have if it has exterior angles of 20 degrees

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book Other Question

I had this problem that I had gotten wrong on a test. Can you help me figure out?
Graph the solution set of the following system of linear inequalities.

x + 4y > 8
y < 2

Lines under the greater/less than signs.
A mother leaves an estate worth £150000 to be divided between her two daughters divided according to their ages 24 and 26. However, death duties of 20% must be paid on the estate.