1. There are large and small trucks in the automobile transportation yard 1 15 vehicles. There are five times as many big trucks as small trucks. How many trucks and cars are there in the transportation yard?

There are two ropes, a rope is 63m long and b rope is 29m long. The two ropes were cut to the same length. As a result, the remaining length of rope A is three times that of rope B.. What are the remaining lengths of rope A and rope B? How many meters per person?

3. The father is 48 years old and the son is 2 1 year old. A few years ago, my father was four times as old as my son.

4. There are 94 workers in Class A and Class B in a processing factory, and 46 workers are temporarily transferred from Class B to Class A due to work needs. At this time, Class B is less than Class A 12. How many people are there in Class A and Class B respectively?