book Maths Puzzle Numerical Ability

75-x p
---- =---
75 100

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book Other Question

If a regular polygon has an ecterior angle of 18 degrees, how many sides would that polygon have?

and

If a regular polygon has an interior angle of 135 degrees, how many sides would that polygon have?

Please help me
Reanne Solve the system by the addition method

x/3-y/2=-5/6

x/5-y/3=-3/5