exam Maths Puzzle Numerical Ability

Simplify:

3
------
4
_______
4
------
5

I do not understand how to complete thsi problem, can anyone help me out? Thank you so much:-)

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exam Other Question
Use substitution to solve: 2x+y=7,5x-2y=4 Find the equation of the line that passes through (5,-3) and is parallel to the line 3x + 4y = 8