Question: In an examination, a pupil's average marks were 70 per paper. If he had obtained 25 more marks for his maths paper and 7 more marks for his science paper, his average per paper would have been 78. How many papers were there in the examination ? O 11 05 4 6

Question: In an examination, a pupil's average marks were 70 per paper

1.	Question: In an examination, a pupil's average marks were 70 per paper. If he had obtained 25 more marks for his maths paper and 7 more marks for his science paper, his average per paper would have been 78. How many papers were there in the examination ? O 11 05 4 6
Answer» <html><body><p>4 papers in examination.Step-by-step explanation:<a href="https://interviewquestions.tuteehub.com/tag/given-473447" style="font-weight:bold;" target="_blank" title="Click to know more about GIVEN">GIVEN</a> average marks x` = 70and added marks are 25 and <a href="https://interviewquestions.tuteehub.com/tag/7-332378" style="font-weight:bold;" target="_blank" title="Click to know more about 7">7</a> which are equal to 32average = total marks (say y) by total papers (say <a href="https://interviewquestions.tuteehub.com/tag/z-750254" style="font-weight:bold;" target="_blank" title="Click to know more about Z">Z</a>) = 70new average = y+32/z =78 <a href="https://interviewquestions.tuteehub.com/tag/assume-384429" style="font-weight:bold;" target="_blank" title="Click to know more about ASSUME">ASSUME</a> that there are 4 papers then <a href="https://interviewquestions.tuteehub.com/tag/substitute-1231629" style="font-weight:bold;" target="_blank" title="Click to know more about SUBSTITUTE">SUBSTITUTE</a> 4 in z y+32/4=78y+32=78×4y+32=312y=312-32y=280=total marks if you divide 280(y) with 4 (z) then you'll get previous average 70</p></body></html>