tolong jawab skrg ya.pliss.pake cara

1. 16,5x4=66
3,75x4=15
66-15=51

a. 16,5-3,75=12,75 kg
12,75×4=51 kg

b. 5,5-2=3,5 m=350 cm
1/4×350=87,5 cm
87,5:7=12,5 cm

c. 4 1/2 =9/2
7 1/4= 29/4
9/2-1/4=18/4-1/4=17/4
17/4×29/4=493/8=6 13/8 kg