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Question

When A = 20, B = 10. Also, when A = 5, B = 40. What can we say about A and B?

A
They are directly proportional.
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B
They are inversely proportional.
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C
A+B = constant
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D
There exists no relation between A and B.
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Solution

The correct option is B They are inversely proportional.
We can observe that when A increases, B decreases.

When A = 20, B = 10.
So, AB = 20×10=200
When A = 5, B = 40.
Therefore, AB = 5×40=200
Hence, we can conclude that A×B=200=constant
Thus, A and B are inversely proportional.

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