Question

Sheena got 7 and 10 marks in two tests, out of total marks 10. find the marks to be obtained in third test so that she gets 80% marks aggregate in three tests

Answer 1

Max. Marks on totaling all subject =3*10
=30
Marks to be optained on totaling to get 80%= 80/100*30
=4/5*30
=4*6
=24
If she gets 7&10 in 2 subject, marks need to score more to get 80%=24-7-10
=24-17
=7

.*. She needs 7 more marks to score to score 80%