The following is the situation of star primary school students donating books to the children in the disaster area: (1) How many books did the whole school donate per grade on average? (2) Ordinary classes in Grade Three. ( 1)( 120+ 145+ 150+203+202+2 12)÷6

= 1032÷6

= 172 (Ben);

A: The school donated 172 books per grade on average.

(2) 150÷3=50 (Ben);

A: In the third grade, each class donated 50 books on average.

(3) 150÷(24+26+25)

= 150÷75

=2 (Ben);

Answer: In the third grade, each person donated 2 books on average.