exam Maths Puzzle Numerical Ability

Find the equation of the line that passes through (5,-3) and is parallel to the line 3x + 4y = 8

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exam Other Question

Simplify:

3
------
4
_______
4
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5

I do not understand how to complete thsi problem, can anyone help me out? Thank you so much:-)
How many liters of a solution containing 22% sugar and how many liters of another solution containing 31% sugar must be mixed together to make 680 liters of solution containing 27% sugar?