It turns out that men account for 4/7, that is, men: women = 4: (7-4) = 4: 3, that is, men are 4/3 of women;

Later, women accounted for 12/23, that is, women: men =12: (23-12) =11,that is, men = 165438.

Because girls are the same, the ratio of boys to girls is different: 4/3-1112 = 5/12.

This is because there are five boys missing, and five is 5/ 12 of girls. If all the parts are taken as a whole, the number of girls can be 5/(5/ 12) = 12 (person).

So the original total: 12/(3/7) = 28 (people)

2、

Lily has more money than every family in 5 yuan, that is, 5 yuan.

Because the book prices are equal, take the book prices as a whole 1,

Then Lili's money is 5/3 times the book price, and everyone's money is 3/2 times the book price.

Difference between them: (5/3)-(3/2) = 1/6.

Lili 5 yuan accounts for 1/6 of the book price, so

Book price: 5/( 1/6) = 30 yuan.

Lili: 30/(3/5) = 50 yuan.

Each family: 50-5=45 (Yuan)