TOLONG PAKAI CARA dan jawaban nya

1) a / 40 = 2 / 16
a = (40 × 2) ÷ 16
a = 5

2) 3/9 = b/15
b = (3 × 15) ÷ 9
b = 5

3) c/20 = 5/25
c = (5 × 20) ÷ 25
c = 4

4) 18/d = 57/95
d = (18 × 95) ÷ 57
d = 30