mohon kerjakan No 1-3 bantuannya

1) misal satu bagian = 1
gemar senam = 1 - (0,55 + 15%)
= 1 - (55/100 + 15/100)
= 100/100 - 70/100
= 30/100
= 3/10 bagian (A)

2) Lina mengisi
= 3/8 × 640 liter
= 240 liter
yg belum terisi
= 640 liter - (240 liter + 240 liter)
= 640 - 480
= 160 liter
= 160/640
= 1/4 bagian
= ¼ × 25/25
= 25/100
= 0,25 bagian (B)

3) (4½ m + 2,6 m) - 3,85 m
= (4,5 m + 2,6 m) - 3,85 m
= 7,1 - 3,85
= 3,25 m