Convert each part of ratio to percentage: (a) 3 : 1 (b) 2 : 3 : 5 (c) 1 : 4 (d) 1 : 2 : 5

(a) 3 : 1
Total parts = 3 + 1 = 4
Percentage of 3 = (3/4) × 100 = 75%
Percentage of 1 = (1/4) × 100 = 25%
(b) 2 : 3 : 5
Total parts = 2 + 3 + 5 = 10
Percentage of 2 = (2/10) × 100 = 20%
Percentage of 3 = (3/10) × 100 = 30%
Percentage of 5 = (5/10) × 100 = 50%
(c) 1 : 4
Total parts = 1 + 4 = 5
Percentage of 1 = (1/5) × 100 = 20%
Percentage of 4 = (4/5) × 100 = 80%
(d) 1 : 2 : 5
Total parts = 1 + 2 + 5 = 8
Percentage of 1 = (1/8) × 100 = 12.5%
Percentage of 2 = (2/8) × 100 = 25%
Percentage of 5 = (5/8) × 100 = 62.5%

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