exam Maths Puzzle Numerical Ability

Can someone please help with this question below??

8.2 = c - 4.6

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exam Other Question

When 2 is subtracted from the numerator and 1 is added to the denominator of a positive fraction the result is 5. Find the fraction given that it lies between 7 and 8. Could you please help me solve, sqrt(2+4x) + sqrt(3-4x)=3

Thank you