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Mathematics for IGCSE & O level - Proportion (Section 3 - No. 19)

If y is inversely proportional to the square root of x, and y=6 when x=9, find y when x=4.
3
6
9
12

Explicaţie

y=k/√x; 6=k/3; k=18. When x=4, y = 18/2 = 9

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