exam Maths Puzzle Numerical Ability

x=9
y=x+0.5z
z=x+y
a=x+y+z
a=?

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exam Other Question

thirty percent of the sulfur desiccated. If 42 tons did not desiccate, how much sulfur was there in all? write an equation in slope intercept form for the line passing through each pair of points
1. (-1,3) and (2,-5)