There were 2 English assignments for each 3 assignments from other subjects. Then, a total of 2 assignments of each 5 were English asignments, and the remaning 3 from those 5 were not English assignments.
Then, the ratio of English assignments to the total amount of assignments was 2:5. The ratio of non-English assignments to the total amount of assignments is 3:5.
Multiply the ratio 3:5 times the total amount of assignments to find the amount of assignments that were not English:
Therefore, 21 assigments were not English.