Answer:
120 x 1/5
Step-by-step explanation:
First, we need to find the total number of donated computers. So, the sum is equal to:
25 + 40 + 25 + 30 = 120
So, the number of computers was 120.
On the other hand, they were shared equally by 5 classrooms, then to know the number of computers that each classroom received, we need to divide 120 by 5.

Since 120/5 can be written as 120 times 1/5, we get that the right answer is:
120 x 1/5