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Mathematics for IGCSE & O level - Proportion (Section 2 - No. 17)

If *y* is inversely proportional to *x*, and *y* = 10 when *x* = 5, what is the constant of proportionality?
2
5
50
100

Vysvětlení

y= k/x; 10 = k/5; k =50.

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