exam Maths Puzzle Numerical Ability

I have a somewhat more complicated problem with linear equations.

The problem relates to a measurement task, which implies that the results are not precise but cluttered with st

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exam Other Question

The sum of twho numbers is 89. Adding four times the first number to the second number gives 155. WHich one of the follwoing equaitons expresses this problem algebraically? Solve for x given: (5+i)x+(1-3i)=(2-3i)x+(2-i)

* ( i ) is understood to be the square root of -1