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Sum of the marks scored by him in 5 subjects = 5 × 75 = 375
Sum of the marks scored by him excluding highest and lowest marks = 3 × 60 = 180
Therefore, sum of his highest and lowest marks = 375 – 180 = 195
Also, highest marks scored by him = 145
Therefore, lowest marks scored by him = 195 – 145 = 50
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