1 окно 3 2 окно 4 а дальше сам

1)

3 1/15 + 1 1/10 = 4 (2+3)/30 = 4 5/30 = 4 1/6,

2)

1 3/25 + 7 1/15 = 8 (9+5)/75 = 8 14/75,

3)

2 9/16 + 4 1/12 = 6 (27+4)/48 = 6 31/48,

4)

3 1/12 + 4 2/15 = 7 (5+8)/60 = 7 13/60