Mathematics, 18.12.2019 08:31 kkelley3141

David scored x marks for his mathematics test, edwin scored 4/5 of what david scored. frank scored 38 marks more than edwin and gabriel scored 5 fewer marks than frank.
(a) express gabriel's marks in terms of x.
(b) if the average mark of the four boys is 64.5, find gabriel's marks for the mathematics test.

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David scored x marks for his mathematics test, edwin scored 4/5 of what david scored. frank scored 3...