When book price goes from 40 to 50, the ratio 4 : 5, the number of books changes in the ratio:
- 4 : 5
- 1 : 1
- 2 : 5
- 5 : 4
Show answer and 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: syllabus Mathematics, Chapter 13, Direct and Inverse Proportions._