Final answer:
To find the number of students who brought their lunch to school on Thursday, multiply the total number of students by 20%.
Step-by-step explanation:
To find the number of students who brought their lunch to school on Thursday, we need to calculate 20% of the total number of students. 20% of 1100 can be found by multiplying 1100 by 0.20:
20% × 1100 = 0.20 × 1100 = 220
Therefore, 220 students brought their lunch to school on Thursday.