Let's denote the amount of liquid in the first vat as \( A \) and the amount of liquid in the second vat as \( B \).
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The first vat is initially empty and is filling at a rate of 6 gallons per minute. Therefore, the amount of liquid in the first vat after \( x \) minutes can be represented by: \[ A = 6x \]
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The second vat starts with 10 gallons and is filling at a rate of 4 gallons per minute. Therefore, the amount of liquid in the second vat after \( x \) minutes can be represented by: \[ B = 10 + 4x \]
To find out when the two vats will have an equal amount of liquid, we set the two equations equal to each other: \[ 6x = 10 + 4x \]
Now, we can solve for \( x \).
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Subtract \( 4x \) from both sides: \[ 6x - 4x = 10 \] \[ 2x = 10 \]
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Divide both sides by 2: \[ x = 5 \]
Thus, the two vats will have an equal amount of liquid after 5 minutes. The equation representing when the two vats have equal amounts of liquid is: \[ 6x = 10 + 4x \]