Question

In a class of 100 students, there are 70 boys whose average marks in Mathematics are 75. If the average marks of the complete class is 72, then average marks of girls is

• A. 74
• B. 73
• C. 65
• D. 68

Answer 1

The correct option is C

65

For 70 boys, total marks $=75\times 70=5250$. Average of complete class $=72\times 7200$

$\therefore$ Marks of 30 girls $=7200-5250=1950$

Average marks of girls $=\frac{1950}{30}=65$