Answer:
supposing there are only 18 students, Im guessing the ratio would be 12-18?
Step-by-step explanation:
6
1/3 x 4 = 1.333....
1.333.... x 9 = 12
12 x 1/2 = 6
64
12
4 and 12 only share 12 which is the lowest number :D
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I think it's 85 yards
