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When book price goes from 40 to 50, the ratio 4 : 5, the number of books changes in the ratio:
A4 : 5
B1 : 1
C2 : 5
D5 : 4
Answer & Solution
Correct answer: D. 5 : 4
1. Inverse proportion inverts the ratio.
2. 150 to 120 is 5 to 4.
3. The two ratios are inverses.
_Source: NCERT Class 8 Mathematics, Chapter 13, Direct and Inverse Proportions._
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