Question

in an examination raju's average marks was 47 per paper. If he had obtained 13 more marks for his maths paper and 7 more marks for his social paper,his average per paper would been 52 How many papers were there in the examination ​

Answer 1

There are 4 papers in his examination.

Step-by-step explanation:

Let there is n number of papers in Raju's examination.

Now, the average marks that Raju obtained is 47.

So, the total marks that Raju has got is 47n.

Now given that, if he had obtained 13 more marks for his maths paper and 7 more marks for his social paper, his average per paper would be 52.

So, we can write the equation $\frac{47n + 13 + 7}{n} = 52$

⇒ 47n + 20 = 52n

⇒ 5n = 20

⇒ n = 4

So, there are 4 papers in his examination. (Answer)