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» 4 papers in examination.Step-by-step explanation:GIVEN average marks x` = 70and added marks are 25 and 7 which are equal to 32average = total marks (say y) by total papers (say Z) = 70new average = y+32/z =78 ASSUME that there are 4 papers then SUBSTITUTE 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