According to "Appendix I+Appendix II = sum", we can get "Appendix II = and-Appendix I".

Replace "Appendix 2 = 95-78 =17";

Then substitute "appendix 1+ appendix 2 = sum" to get 42+ 17=59.

The correct number is 59.

1. When Liu Jie added, he mistook 2 of several numbers for 8 and 4 of ten numbers for 7, and the result was 95. What's the correct number?

2. When Xiaohong was doing a calculation problem of adding a two-digit number and a three-digit number, due to carelessness, she mistook eight mistakes in an added number for three, and six mistakes in the tenth number for nine, and the sum was 438. What is the correct sum?

3. When Xiao Ming did a calculation problem of subtracting two digits from three digits, he wrote 3 in the minuend as 5 and 6 in the tenth digit as 0, so the difference was 189. What is the correct difference?

4. When Xiaoli was doing the addition problem, due to carelessness, she took an addend of 340 as 430, and the calculated sum was 700. What should be the correct result?

5. Xiaoming has 18 yuan, Xiaohong has 24 yuan money, and how much should Xiaohong give Xiaoming, so their money is the same?

6. A river bank is12m long, and a tree is planted every 4m. How many trees were planted from beginning to end?

7, a big shark, the tail length is half of the body length, the head length is half of the tail length, the known head length is 3 meters, how many meters is this big shark?

8. Weight of a barrel of oil 19 kg. Half-eaten oil, barrel weight 12 kg. How much oil did you eat? How many kilograms of oil are there in the oil drum?

9. There are fewer story books on the bookshelf than comic books 15. There are 8 magazines and 32 story books on the shelf. How many comic books are there? How many story books and comic books are there?

10. Pour a glass of water into an empty bottle, which weighs * * *140g. If you pour three glasses of water, the bottle weighs 260 grams. What is the weight of an empty bottle?

1 1. Mom bought a pair of leather shoes 52 yuan and a pair of cloth shoes 12 yuan, and paid the shop assistant 100 yuan. How much should I get back? (Answer in two ways)

12. There are 50 goldfish in the fish tank, including 15 red goldfish, 20 flower goldfish and the rest are black goldfish. How many black goldfish are there? (Answer in two ways)

13. In the Science Palace, there is a wonderful big box with four middle boxes, and each middle box has four small boxes. How many boxes are there in a box?

14, it took Xiao Qiang 2 minutes to walk from the first floor to the third floor. How many minutes will it take if he walks from the first floor to the fifth floor at the same speed?

On the physical education class, students stood in a square doing gymnastics. Seen from the front, back, left and right, Xiao Fang is the third. How many students are doing gymnastics? (Drawing and Calculation)

16, the students lined up to sing, with the same number of people in each row. Xiaohong's position is left four, right four, front four and back four. How many people are singing?