Tell me the answer to the Olympic math problem!

(2) Solution: If the correspondent can catch up with the troops after x hours, then 8x=3x+75, the solution is x=15 8x=12. A: The correspondent can catch up with the troops after 15 hours. At this time, it is 12 kilometers (3) away from Xi 'an. Solution: If there are X bags of wheat, 6x-9(28-x)=18, and x=18 28-x=1. Answer: There are 18 bags of wheat and 1 bags of rice. (4) Solution: If there are X people in Jiajia's family, then 8+2(x-2)+4=6+4(x-1)-12 will get x=9 8+2(x-2)+4=26 A: There are 9 people in Jiajia's family, and there are 26 apples in this basket. (1) Solution: Suppose that X instruments were damaged in the accident, then 15x+8x-3=175. The solution is x=5. A: Five instruments were damaged in the accident.