In the table, x and y are in inverse proportion; the known pairs are plotted on the graph. What number should replace the "?"?

Question

Accepted Answer

15. In inverse proportion xy is constant: 3 × 50 = 5 × 30 = 150 . So 10 × y = 150 gives y = 15 . (20 continues the drop of 5 seen from 30 to 25 — the pattern is not a constant difference.)

In the table, $x$ and $y$ are in inverse proportion; the known pairs are plotted on the graph. What number should replace the "?"?

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