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Two quantities x and y are in inverse proportion when:

Ax times y stays constant
Bx/y stays constant
Cx + y stays constant
Dx - y stays constant
Answer & Solution
Correct answer: A. x times y stays constant
1. As one rises the other falls in proportion. 2. The product xy equals a constant k. 3. Speed and time for a fixed distance behave this way. _Source: syllabus Mathematics, Chapter 13, Direct and Inverse Proportions._
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