exam Maths Puzzle Numerical Ability

I am supposed to simplify this problem and I am not sure I have done it correctly.

2+2/5 / 2-1/2

is the answer 8/5?

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exam Other Question

Can someone please help me with this problem it is from a work sheet.

solve the system by graphing
x+y=4
-x=y=2 For the following function, C computes the cost in millions of dollars implementing a city recycling project when x percent of the citizens participate.
C(x) = 1.4x/(100-x)
a.)