When each plant had been growing for 6 weeks, how much TALLER, in centimeters, was the plant on which fertilizer A had been used than the one using fertilizer B?

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Question 13

When each plant had been growing for 6 weeks, how much TALLER, in centimeters, was the plant on which fertilizer A had been used than the one using fertilizer B?

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Answer: 30centimeters