exam Maths Puzzle Numerical Ability

3(9k-4)-4(5n-3)

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Going into the final exam, which will count as 2 tests, Brooke has a test score of 80, 83,71,61, 95. What score does Brooke need on the final in order to have an average score of 80? A boat moves 9 kilometers upstream in the same amount of time it moves 19 kilometers downstream. If the rate of the current is 9 kilometers per hour, find the rate of the boat in still water.