exam Maths Puzzle Numerical Ability

Help me solve this: 3x^2/5 /x^3/35

x/x^2-16 -4/x^2+5x+4

a^2-12a+35/5-a /(a+7)

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Would someone show me step by step how to figure out this word problem? Thank you
The length of a rectangle is 1cm more than 5 times its width. If the area of the rectangle is 79 cm^2, find the dimensions of the rectangle to the nearest thousandth. (-4/5) multiplied by (3/4) divided by 0.7