exam Maths Puzzle Numerical Ability

R/(|R + j60000|) = .85

The answer for R is 105000, but I don't know how they got it.
j is imaginary number.

Thanks

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exam Other Question

Can someone please help me?

Solve the system by graphing.
x – y = 5
x + y = 3
X+2 over 3= -1/3[X+2]