exam Maths Puzzle Numerical Ability

the sun of two numbers is 20 their difference is 4
b. Solve by elimination to find the two numbers

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exam Other Question

Please help me solve this by using the first eight rules of inference to derive the conclusion.
Problem 26.
1. ( P v S) ב ( E ב F)
2. ( P v T) ב (G ב H) y-2-8 sqrt(y-2)+15=0