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A child's age and the mother's age both increase together but are not in direct proportion because:
ATheir product is fixed
BTheir ratio keeps changing
CTheir values never change
DTheir sum is always fixed
Answer & Solution
Correct answer: B. Their ratio keeps changing
1. Direct proportion needs a constant ratio.
2. The ratio of the two ages is not the same every time.
3. Growing together is not enough.
_Source: NCERT Class 8 Mathematics, Chapter 13, Direct and Inverse Proportions._
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