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

Video Solution:

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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