Question
The average score received by Irene, Sarah, Joelle and Gabby in a recent Science test was 61 marks. Irene and Sarah both got 8d marks each while Joelle got half of Gabby's marks. How many marks did Joelle score for the test? Express your answer in terms of d.
3 m

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The average score received by Irene, Sarah, Joelle and Gabby in a recent Science test was 61 marks. Irene and Sarah both got 8d marks each while Joelle got half of Gabby's marks. How many marks did Joelle score for the test? Express your answer in terms of d.