exam Maths Puzzle Numerical Ability

(W+2)/(2W-2)=5 can you help solve for W in the steps so I can learn?

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exam Other Question

Find values for m and b in the following system so that the solution to the system is (-3, 4).

5x+7y = b
mx+y = 22 student makes 338 points after 4 test worth 100 points. What is the least he could score for 82%. Shown as a formula. Answer is 72 Points I believe, but the corret formula is ???