Question
The average score received by Tiffany, Esther, Shannon and Mary in a recent Science test was 89 marks. Tiffany and Esther both got 10x marks each while Shannon got half of Mary's marks. How many marks did Shannon score for the test? Express your answer in terms of x.
3 m

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The average score received by Tiffany, Esther, Shannon and Mary in a recent Science test was 89 marks. Tiffany and Esther both got 10x marks each while Shannon got half of Mary's marks. How many marks did Shannon score for the test? Express your answer in terms of x.