book Maths Puzzle Numerical Ability

(a-x):(b-x)be the duplicte ratio of (a2:b2).Show that 1/a + 1/b = 1/x

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book Other Question

Juliet runs out of gas in Barnhaven, South Carolina. She walks 9 mi west and then 5 mi south looking for a gas station. How far is she from her starting point? Round to the nearest tenth.
please answer this question for me- translate the quotient of a number and seven is two into an equation and solve