exam Maths Puzzle Numerical Ability

solve and check:

SQRT of x-1 =x-3

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exam Other Question

Divide and Simplify: 5x-7 divided by 25x^2-49/5x62+27x+28 if a stick that is 13 inches long casts a shadow of length 16 inches at the same time an office buildings shadow is 85 ft. long, how tall is the building? Round to one decimal place.