Question
The average score received by Pamela, Nora, Tammy and Usha in a recent History test was 77 marks. Pamela and Nora both got 10m marks each while Tammy got half of Usha's marks. How many marks did Tammy score for the test? Express your answer in terms of m.
3 m

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The average score received by Pamela, Nora, Tammy and Usha in a recent History test was 77 marks. Pamela and Nora both got 10m marks each while Tammy got half of Usha's marks. How many marks did Tammy score for the test? Express your answer in terms of m.