exam Maths Puzzle Numerical Ability

Divide 7q3r6.8q3r6/2q3r3

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Number 2

Copper wire - A copper conducting wire measures 84centimeters in length. It is cut into two pieces. The shorter piece is 5 centimeters shorter than the long piece. Find the length of each piece.
2. 1/2 ln x - 2 ln y=