Question
The average score received by Tiffany, Barbara, Sabrina and Ivory in a recent Chinese test was 86 marks. Tiffany and Barbara both got 10m marks each while Sabrina got half of Ivory's marks. How many marks did Sabrina score for the test? Express your answer in terms of m.
3 m

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The average score received by Tiffany, Barbara, Sabrina and Ivory in a recent Chinese test was 86 marks. Tiffany and Barbara both got 10m marks each while Sabrina got half of Ivory's marks. How many marks did Sabrina score for the test? Express your answer in terms of m.