exam Maths Puzzle Numerical Ability

please help to solve

Find a :

2c/a - b = m/x

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exam Other Question

Please help I do not understand this.
Find the first and third quartiles, q1 and q3, of the following set of numbers.
13, 4, 12, 16, 8, 14, 8, 3, 10, 8 Can someone please, please answer the following:

x+2 over x divided by x-2 over 3x.

Please help me solve this.

Thank you.