Answer:
Step-by-step explanation:
Set up a proportion
15 Liters / 4 gallons = 210 Liters / x Cross Multiply
15x = 4 * 210 Combine the right
15x = 840 Divide by 15
x = 840 / 15
x = 56 gallons
C=2*pi*r
C=d*pi
d=8.4
C=(8.4)pi
8.4*pi
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Shjad
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