Answer:
Out of 350 students in line, 200 of them wore a hat.
Out of 350 students, 150 did not wear a hat.
Explanation:
I divided 350 by 7 and got 50. Then, I multiplied 50 by 4 (the number of students out of 7 that wore a hat) to get 200, which is the number of students in line that did wear a hat. The rest did not wear a hat, so to find that number I subtracted 200 from 350 and got 150, which is the number of students that didn't wear a hat.
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