Question

a boy get 70% of total marks it appeared in 4 subjects if the maximum marks in each subject are hundred and he gets 81, 66, 68 how much does he score in fourth subject

Answer 1

the answer of question is 65

Answer 2

$70\%of \: 400 = 7 0 \times 400 \div 100 = 280$
so he should get a total of 280 marks to gain 70%
so it is given that that in the first three exams he secured 81,66,68
so.... 81+66+68+x=280
that gives x =280-215=65
so he should get 65 marks in the last exam.. hope this helps