In the national fitness activities in the community, the father and son took part in the skipping competition. At the same time, the father jumped 180 and the son jumped 2 10. It is known that the son jumps 20 times more than the father, and the father and son jump X and X+20 times per minute.

180/X=2 10/﹙X+20﹚

X= 120

X+20= 140 Father and son jump 120 and 140 every minute respectively.