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If x and y vary inversely and x is 20 when y is 6, then k is:
A126
B140
C112
D120
Answer & Solution
Correct answer: D. 120
1. For inverse proportion the product xy equals k.
2. Here that is 20 times 6.
3. So k is 120.
4. The answer is 120.
_Source: NCERT Class 8 Mathematics, Ch 11 'Direct and Inverse Proportions'_
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