Question
The average score received by Rachel, Nora, Kathy and Gem in a recent Science test was 85 marks. Rachel and Nora both got 8a marks each while Kathy got half of Gem's marks. How many marks did Kathy score for the test? Express your answer in terms of a.
3 m

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The average score received by Rachel, Nora, Kathy and Gem in a recent Science test was 85 marks. Rachel and Nora both got 8a marks each while Kathy got half of Gem's marks. How many marks did Kathy score for the test? Express your answer in terms of a.