exam Maths Puzzle Numerical Ability

2x + 3y = 1
5x + 3y = 16
x = ?
y = ?

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exam Other Question

It says to simplify:
9/(radical sign)2-/8
Is this correct?
I got:
9/2-/4*2=9/2-2/2
7/2
I appreciate your imput!
Thank you
CH how do you solve 2x+25=12