In an examination of n question, a student replied 15 out of the first 20 questions correctly.. Of the remaining questions ,he answered one -third correctly. All the questions have the same credit . If the student gets 50% marks,
the value of n is:
`15 + 1/3(n - 20) ` = 50% of n = `50/100 n = n/2 hArr 90 + 2n - 40 = 3n hArr n = 50.`
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