1. These four numbers are arranged into any four digits (not starting with 0), all of which are multiples of 3, making a total of 18 * * *.

2037,2073,2307,2370,

2703,2730,3027,3072,

3207,3270,3702,3720,

7023,7032,7203,7230,

7302,7320.

The third number is 2307.

2. Assuming that barrel A has X liters, barrel B has x+3/ 14*2 liters, then 2x+3/7= 10/7, barrel A has x= 1/2 liters, and barrel B has 65438. ..

3. Suppose the existing deposit in Li Hui is X yuan, then Wang Li's existing deposit is 2x, that is, 150+2x=350+x, and x=200, that is, Li Hui's existing deposit is in 200 yuan.

4. The glass balls of Little Red Riding Hood are twice as big as those of cockroaches, which means that the sum of the glass balls of Little Red Riding Hood and cockroaches must be a multiple of 3,18+19+21+23+25+34 =140, so the remaining number is not a multiple of 3. So140-19 =121is not a multiple of 3,140-23 =117 is a multiple of 3,1. So there are 23 broken glass balls. The three bags that Little Red Riding Hood takes are 19, 25, 34 * * 78, and the cockroaches take 18, 2 1 and * * 39 respectively.

The landlord gave the best!