If y varies inversely as x and y = 18 when x = 4, what is y when x = 24?

For inverse variation, the product of x and y stays constant: xy = k. Using y = 18 when x = 4 gives k = 4 × 18 = 72, so when x = 24, y = 72 ÷ 24 = 3; the correct choice is 3.

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