Answer:
If Fangfang gives five round pieces, Fangfang loses five and there are five more round pieces. Then their difference is 5+5= 10. If Fangfang gives five, Zhang Fangfang loses five, and their distance is 5+5= 10. 10+ 10=20 Now their difference is 20, and now their money ratio is 1 3 (1/3) 20/(3+1)/(3-1).