book Maths Puzzle Numerical Ability

please help me with this problem i think it's correct but not sure 1/2(550+x)/20=25 2/1x25/1=2/1x1/2(550+x)/20 50=550+x/20 20/1x50/1=550+x/20x20/1 1000=55

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Solve log2(x+2) = log2^3x. Each of two countries sends five delegates to a negotiating conference. A rectangular table is used with five chairs on each long side. If each country is assigned a long side of t