Question

a boy get 70% of the total marks he appeared in 4 subject is the maximum marks in each subject Ahmedabad and he gets 81,66 and 68 marks in 3 subject how much does score in the fourth subject

Answer 1

$\frac{81 + 66 + 68 + x}{4} = 70 \\ x = 280 - 81 - 66 - 68 = 65$