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Question 12

If $$3x+1=2y-1=5z+3=7w+1=15$$, the value of $$6x-3y+5z-8w$$ is

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Solving each part gives $$x=\frac{14}{3}$$, $$y=8$$, $$z=\frac{12}{5}$$ and $$w=2$$. Then $$6x-3y+5z-8w = 28-24+12-16=0$$, which is not among options a, b or c, so the answer is none of these.

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