To find the best estimate for the number of seeds in each flower pot, we can divide the total number of seeds by the number of flower pots.
Carlos has 194 seeds and 11 flower pots.
Calculating the division: \[ 194 \div 11 \approx 17.64 \]
Since we are looking for the best estimate among the options given (10, 20, 30, 40), the closest estimate to 17.64 is 20.
Thus, the best estimate for the number of seeds in each flower pot is 20.