Question
The average score received by Lucy, Tammy, Erika and Tiffany in a recent Science test was 97 marks. Lucy and Tammy both got 10m marks each while Erika got half of Tiffany's marks. How many marks did Erika score for the test? Express your answer in terms of m.
3 m

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The average score received by Lucy, Tammy, Erika and Tiffany in a recent Science test was 97 marks. Lucy and Tammy both got 10m marks each while Erika got half of Tiffany's marks. How many marks did Erika score for the test? Express your answer in terms of m.