Question

the average marks obtaimed by the total students in first term exam are 85% and the average marks obtained by girls students are 90% if there is 80 girls and 70 boys students who appeared in the exams then what is the average marks obtained by the boys students​

Answer 1

Explanation:

let avg % of boys be m

Marks obtained by all girls =90×80=7200

Marks" " " " " boys=mX70=m70

now

(Marks obtained by girls +boys)/no of girl+boys=avg

(7200+70x)/(80+70)=85

7200+70×=85×150

70x=12750-7200=5550

x=79.2857142857

approx 79.3 per