Answer:
17 square units
Explanation:
5 × 3 = 15 un²
15 un² + 1 un² + 1 un²
17 un²
200 · y = 9 · 420
200y = 3780
200y ÷ 200 = 3780 ÷ 200
y = 18.9
18.9 gallons
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