I can not see the picture so i caN NOT HELP SORRY
We know that 3/10*20=6 students are eating salads.
We also know that 3/5*20=12 students are eating sandwiches.
Assuming each person only eats one thing, there are 20-12-6=2 students eating lunches other than salads or sandwiches.
Option A, it’s the base times the height
just multiply 12 times 4. thats 48. so 48 divided by 4 is 12