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ATQ, Total marks of D1, D2 and D4 = 80 + 70 + 75 = 225 Average marks of D1, D2 and D4 = 225/3 = 75 75 means 75% because the maximum marks of each subject are 100. Total marks of D3 and D5 = 50 + 55 = 105 Average marks of D1 and D5 = 105/2 = 52.5 Average percentage of D1 and D5 = 52.5% Required difference = 75% – 52.5% = 22.5%
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