Question

Amar wrote exams in four subject - physics,chemistry,biology and social science. The ratio of marks he got in these exams was 2:3:4:5 . He got an aggregate of 70% in these exams .Each exams had the same maximum marks . In how many exams did he get more than 50% ?

Answer 1

Let the ratios be x.
100(2x + 3x + 4x + 5x) = 280
100 (14x) = 280
10 (14x) = 28
10 (x) = 2
x = 0.2

Marks will be 40%,60%,80% and 100%

So..we have 3 exams in Which he got.mroe than 50%...