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

Solution:

(a) In the ratio 3:1,

Total number of parts = 3 + 1

= 4

Percentage of first part = 3/4 × 100

= 75%

Percentage of second part 

= 1/4 × 100

= 25%

(b) In 2:3:5,

Total number of parts = 2 + 3 + 5

= 10

Percentage of first part = 2/10 × 100

= 20%

Percentage of second part = 3/10 × 100

= 30%

Percentage of third part = 5/10 × 100

= 50%

(c) In ratio 1:4,

Total number of parts = 1 + 4

= 5

Percentage of first part = 1/5 × 100

= 20%

Percentage of second part = 4/5 × 100

= 80%

(d) In ratio 1:2:5,

Total number of parts = 1 + 2 + 5

= 8

Percentage of first part = 1/8 × 100

=12.5%

Percentage of second part = 2/8 ×100

= 25%

Percentage of third part = 5/8 × 100

= 62.5%

☛ Check: NCERT Solutions for Class 7 Maths Chapter 8

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Video Solution:

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

Class 7 Maths NCERT Solutions Chapter 8 Exercise 8.3 Question 2

Summary:

The conversion of the following ratios to percentage (a ) 3:1 (b) 2:3:5 (c) 1:4 (d) 1:2:5 are a) Percentage of first part = 75%, Percentage of second part = 25%, b) Percentage of first part = 20%, Percentage of second part = 30%, Percentage of third part = 50%, c) Percentage of first part = 20%, Percentage of second part = 80%, d) Percentage of first part = 12.5%, Percentage of second part = 25%, Percentage of third part = 65%.

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