You need x 20 to get to 10000, so do the same with 150 and get 3000, so it is 3000/10000
3/12x5 is the answer of your question.
Adding the student with eight siblings will increase the class average amount of siblings because this student has more siblings than the average.
Therefore, the average number of siblings that each student has is larger than the original average.
I hope you understood....if not...comment and I will be willing to still help
