15 целых 6/20 - 4 целых 9/20

Question

15 целых 6/20 - 4 целых 9/20

Answer 1

14 20/20+6/20=14 26/20-4 9/20=10 17/20.

Answer 2

15 6/20 - 4 9/20 = 14 26/20 - 4 9/20 = 10 17/20
Ответ: 10 целых 17/20.