Question

9. Out of a class of 45 students, five were absent, 30% of the remaining had failed to homework. Find the number of students who did the homework. 1​

Answer 1

Answer:

∴  $28$ students did the homework in the class.  

Step-by-step explanation:

In context with question asked,

• We have to the number of students who did the homework.
• It is given that, Total number of students in a class = $45$

                    Number of absent students = $5$

          % of the remaining students who failed to do homework = $30$%

• Now,

    Number of present students = Total student - absent student

                                              = $45-5$

                                              = $40$

• Number of students who failed to do homework = $30$% of $40$ students

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

                                              = $12$

• Now,

     Number of students who did homework = $40-12$

                                                               = $28$

• ∴  $28$ students did the homework in the class.