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Two quantities x and y are in direct proportion when:
Ax/y stays constant
Bx + y stays constant
Cx times y stays constant
Dx - y stays constant
Answer & Solution
Correct answer: A. x/y stays constant
1. Both rise or fall together in the same ratio.
2. The ratio x over y is a constant k.
3. So x equals k times y.
_Source: NCERT Class 8 Mathematics, Chapter 13, Direct and Inverse Proportions._
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