exam Maths Puzzle Numerical Ability

Simplify.
-7[27-(12-39)]=
Is the answer to this 273-189-84 ??
I a close or way off the planet??

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exam Other Question

4x-5y=0 The simple interest "I" on a principal of "P" dollars at interest rate "r" for time "t", in years, is given by I = Prt. Find the simple interest on a principal of $6000 at 3% for 2 years. (Hint: 3%=0.03)

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