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Question
Both x and y vary inversely with each other. When x is 10, y is 6, which of the following is not a possible pair of corresponding values of x and y?
Options
12 and 5
15 and 4
25 and 2.4
45 and 1.3
Solution
45 and 1.3
Explanation:
Since, x and y vary inversely, i.e. x × y = k ...(Constant)
If x = 10 and y = 6
∴ xy = 10 × 6 = 60
In option (a), 12 × 5 = 60
In option (b), 15 × 4 = 60
In option (c), 25 × 2.4 = 60
But in option (d), 45 × 1.3 = 58.3
Hence, 45 × 1.3 = 58.3 is correct.
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