lanjut pertanyaan nya ya kak. hehe

m = 1 3/7
n = 120%
p = 2 4/5

m x n
= 1 3/7 x 120%
= 10/7 x 120/100
= 1200/700
= 12/7

m x p
= 1 3/7 x 2 4/5
= 10/7 x 14/5
= 2/1 x 2/1
= 4

m : p
= 1 3/7 : 2 4/5
= 10/7 : 14/5
= 10/7 x 5/14
= 50/98
= 25/49

n : p
= 120% : 2 4/5
= 120/100 : 14/5
= 6/5 x 5/14
= 6/1 x 1/14
= 6/14
= 3/7

Jadi yang benar adalah n : p = 3/7