exam Maths Puzzle Numerical Ability

Simplify

3 4 5
-- + --- - ---
n n n

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exam Other Question

A rectanular plot has been fenced with 500ft of wire. find the length and width of th plot if the length is 4 more than twice the width. Be sure to show both length and width along with units in your answer.

PLEASE SHOW ALL WORK
Can you please help me solve: In a golden rectangle the ratio of the length to the width equals the ratio of the length plus width to the length. Find the value of this golden ratio. (do not approximate the answer)