Question

A student attempts x number of questions. He answers 15 correctly out of first 20 questions and of the remaining questions, he answers 1/3 correctly. If all questions have same credit and the student gets 50% marks, then find the value of x?​

Answer 1

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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

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Solution

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Correct option is

C

50

⇒ Student attempts n questions.

⇒ Out of 20 question he answers 15 correctly and of (n−20) questions he answered

3

1

correctly.

⇒ The student gets 50% marks.

∴ 15+

3

1

(n−20)=50% of n

⇒ 15+

3

1

(n−20)=

100

50

×n

⇒ 15+

3

1

(n−20)=

2

n

⇒ 90+2(n−20)=3n

⇒ 90+2n−40=3n

∴ n=50

Answer 2

Answer:

x = 29. plz mark me genius

Step-by-step explanation:

plz mark me genius plz