9. (15 points) At a party one day, Kung Fu Panda exchanged all the buns he had for Garfield's spaghetti, with 3 buns for 2 servings of spaghetti. Winnie the Pooh also exchanged all the honey he had for Garfield's spaghetti, with 4 jars of honey for 5 servings of spaghetti. It is known that Kung Fu Panda and Winnie the Pooh received the same amount of spaghetti, and the number of buns Kung Fu Panda had differs from the number of honey jars Winnie the Pooh had by 28. How many servings of spaghetti did Garfield bring at least? $\qquad$
【Answer】Solution: According to the analysis of the problem, 15 meat buns $=10$ portions of flour; 16 cans of honey $=10$ portions of flour, from which we can deduce that for every 10 portions of flour, honey exceeds meat buns by $16-15=1$. Since the number of meat buns that Kung Fu Panda has and the number of honey cans that Winnie the Pooh brings differ by 28,

the number of meat buns is: $28 \times 15=420$ portions;
the number of honey cans is $28 \times 16=448$ cans; 448 - 420 is exactly $28 ;$
From this, we can conclude that Garfield must have brought at least $10 \times 28 \times 2=560$ portions of flour.