exam Maths Puzzle Numerical Ability

Write an algebraic expression for "three times the difference of a number x and 5"

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exam Other Question

9/x^2-9x+14 - 7/x-2 Linda headed east at 20 miles per hour on her bicycle at 9am. Three hours later Shana headed west from the same place walking at 6 miles per hour. What time was it when they were 164 miles apart?

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