book Maths Puzzle Numerical Ability

If a regular polygon has exterior angles of 12 degrees, how many sides will the regular polygon have?

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book Other Question

prove that each number is rational by finding a pair of ntegers whose ratio or quotient is equal to the number
1. 3.56
2. -0.000230
3. -1.6 with a line over the 6
4. 5 3/8
Solve the formula for the variable

b+3=f
e 2