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

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.