B.10/9 : 1 2/3: C2/25:6/10:5/9: D1 1/2:2 2/3:3 3/4:

B. 10/9 : 1 2/3 = 10/9 : 5/3 = 10/9 x 3/5 = 10/15 = 2/3

c. 2/25 : 6/10 : 5/9 = 2/25 x 10/6 x 9/5 = 36/150 = 6/25

d. 1 1/2 : 2 2/3 : 3 3/4 = 3/2 x 3/8 x 4/15 = 9/15 = 3/5

B . 10/9 × 3/6 = 30/54 = 10/27
C. 2/25 × 10/6 = 20/150 = 2/15 × 9/5 = 18/75 = 6/25
D. 3/2 × 3/8 = 9/16 × 4/15 = 36/240 = 18/120= 9/60 = 3/20