M + Tu + W + Th = 4 x 48 = 192
Tu + W + Th + F = 4 x 46 = 184
M = 42
Tu + W + Th = 192 - 42 = 150
F = 184 ? 150 = 34
Difference of marks = 72 + 61 ?48 ?65 = 20?Correct average marks = 68 +20/20= 69
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