Little monkey, bear and puppy meet and come to play in the street. They came to the supermarket and saw a cantaloupe just in 30 yuan, so everyone took 10 yuan and bought a cantaloupe. As soon as they walked out of the gate, a shop assistant ran out and said, "We have a discount today, as long as 25 yuan, this is your 5 yuan." The dog said, "Let's share the five dollars!" The bear said, "Good!" But the little monkey said, "We can't finish this!" " Then one person is 1 yuan, and the remaining two dollars will buy a pack of melon seeds. "The dog and the bear said yes.

On the way back, the bear said, "We spend money from 9 yuan for one person, and three times nine equals 27 yuan for three people. We also bought a pack of melon seeds, and one spent 29 yuan. Where did the dollar go? " The little monkey and the puppy said, "Yes! Why is a dollar missing? Strange? "

Children, do you know where this dollar went?

It turns out that 27 yuan includes 2 yuan. Whoever buys melon seeds, plus each person 1 yuan, is exactly 30 yuan.