tolong dijawab dong yg pintar, dan baik dari no.11-15!pliss pake cara

12.
7 3/4 + 1/6 - 1/3
31/4 +1/6 -1/3
93/12 + 2/12 - 4/12
95/12 - 4/12
91/12
7 7/12

13.
7 1/3 - 8 1/2
22/3 - 17/2
44/6 - 51/6
-7/6
-1 1/6

11.
dijadikan desimal
7/13 = 0,538

12.
7 3/4 + 1/6 - 1/3
= 31/4 + 1/6 - 1/3
= 93/12 + 2/12 - 4/12
= 95/12 - 4/12
= 91/12
= 7 7/12

13.
7 1/3 kg - 8 1/2 kg
= 22/3 - 17/2
= 44/6 - 51/6
= - 7/6
= -1 1/6

No. 14 lihat gambar

15.
16 2/3%
= 16 2/3 : 100
= 50/300
= 1/6%