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Verified answer
1) a / 40 = 2 / 16a = (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