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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book Other Question

The parking lot at George's Grocery is 60ft. long and 40ft. wide. George plans to expand the parking lot by increasing the length and width by the same amount (x).

1.Write an ex solve

(-6x^4+3x^2-16) + (4x^2+4x-7)

please show work
thanks