Arathi took 3 examinations in a year. The
marks obtained by her in the second and third
examinations are more than 5 and 10 respectively
than in the first examination. If her average mark
is at least 80 find the minimum mark that she
should get in the first examination?

Dear student,
Let the marks obtained in first exam be 'x'Marks obtained in second exam=x+5Marks obtained in third exam=x+10Average marks=sum of marks obtainedNo. of marks80=x+x+5+x+10380=3x+15380=x+580-5=xx=75Thus marks obtained in first exam is 75

  • 3
What are you looking for?