Question

Precentage of students securing grade A It is 60% .Which is written as 66%​

Answer 1

Answer:

Let us consider the total scored =(90%0f100+60%of150+54%of200)

(

100

90

×100+

100

60

×150+

100

54

×200)

=288

Total maximum marks =(100+150+200)=450

Aggregate percentage =(

450

288

×100)%

=64%

I don't know that but you can refer these

Answer 2

Answer:

I think we have to find error%

so this is the solution

$\frac{error}{correct\%} \times 100 \\ error = 66 - 60 = 6 \\ \frac{6}{60} \times 100 \\ = 10\% \\ so \: the \: correct \: answer \: is \: 10\%$