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For direct proportion, which stays constant?
Ax by y
Bx plus y
Cx less y
Dx times y
Answer & Solution
Correct answer: A. x by y
1. In direct proportion x equals k times y.
2. Rearranging gives x divided by y equals k.
3. So the ratio x by y stays constant.
4. The answer is x by y.
_Source: NCERT Class 8 Mathematics, Ch 11 'Direct and Inverse Proportions'_
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