"In an examination of `n`questions, a student replied 15 out of the first 20 questions correctly.
Channel: Doubtnut
Date: 2020-04-05

"In an examination of `n`
questions, 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
a.20
b. 40
c. 50
d. 100"