There is inverse variation between x and y, and when x = 3, y = 7, find y when x = 5?
- 4.7
- 4.2
- 4.4
- None of these
Explanation
Given x ∝ 1/y, so xy = k (constant).
When x = 3, y = 7, k = 3 × 7 = 21.
Now, when x = 5, 5y = 21.
y = 21/5 = 4.2.
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