Question

13. The average marks of a student in Maths and English is 75. His average of
marks in Maths and Science is 60. What is the difference between the marks
which he obtained in English and Science?
75+​

Answer 1

Answer:

Step-by-step explanation:

Let marks obtained in math be a , in science be b and in English be c .

Then,

(a+c)/2 = 75

Then, a+c = 75*2

=> a+c = 150 ———— i

Similarly,

a+b = 120 ———— ii

Now by subtracting equation ii from i we get

a+c - ( a+b) = 150-120

=> c-b=30

Therefore the difference between marks scored in English and science is 30.

Hope it helped....