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The headmaster of the school gymnastics formation asked how to make a 4:3 formation of 300 people. Please answer the math well, thank you.
Solution: Let the length be 4X and the width be 3X.

4X × 3X =300

12X^2=300

x^2=25

X=5

4X=20，3X= 15

20 captains, width 15.

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