exam Maths Puzzle Numerical Ability

Find the simple interest on a principal
of $6000 at 3% for 2 years. (Hint: 3% =0.03)

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exam Other Question

z-5 + z-2
zē-9 12-4z
for this question i am asked to simplify it.
Solving by elimination..
3x+2y=9
-x+3y=8