Let me try with simple numbers:
Group A has 2 mainstream students, who each receive $1.50 of funding (the minimum necessary for the students to learn). They also have 1 special education student, who receives $3.50 in funding (the minimum amount of funding necessary for the student to learn)
Group B has 1 mainstream student, who receives $1 of funding, and two special education students, who each receive $3 of funding.
Now, Group B receives more total money ($7 vs. $6.50), but all of their students are receiving insufficient funding. The mainstream student is receiving only $1, compared to the $1.50 needed to provide a minimum education, and the special education students are receiving $3, less than the $3.50 needed to provide a minimum education.
If you still don’t understand it at this point there’s no help for you. To be honest, every time I talk with you I find myself increasingly incredulous that you did well on an IQ test–understanding the above isn’t really a high-IQ task, and you failed it.