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

(a) 3 : 1
Total part = 3 + 1 = 4
Therefore, Fractional part = 3/1 : 1/4
⇒ Percentage of parts = 3/4 x 100 : 1/4 x 100
⇒ Percentage of parts = 75% : 25%

(b) 2 : 3 : 5
Total part = 2 + 3 + 5 = 10
Therefore, Fractional part = 2/10 : 3/10 : 5/10
⇒ Percentage of parts = 2/10 x 100 : 3/10 x 100 : 5/10 x 100
⇒ Percentage of parts = 20% : 30% : 50%

(c) 1 : 4
Total part = 1 + 4 = 5
Therefore, Fractional part = 1/5 : 4/5
⇒ Percentage of parts = 1/5 x 100 : 4/5 x 100
⇒ Percentage of parts = 20% : 80%

(d) 1 : 2 : 5
Total part = 1 + 2 + 5 = 8
Therefore, Fractional part = 1/8 : 2/8 : 5/8
⇒ Percentage of parts = 1/8 x 100: 2/8 x 100 : 5/8 x 100
⇒ Percentage of parts = 12.5% : 25% : 62.5%

lass 7 Maths Chapter 8 Exercise 8.3

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