Question

out of out of class of 45 student 5 year absent 30% of remain and fail to do homework find the number of student who did the homework​

Answer 1

total no of students- 45

students absent-5

students present- 45-5=40

% of students fail to do homework=30%

no of students fail to do homework-

$\frac{30}{100} \times 40 = 12$

No of students who did the homework= 40-12=28

or

% of students who did the work= 100-30=70%

no. of students who did the work=

$\frac{70}{100} \times 40 = 28$

Therefore, 28 students did the homework