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Mathematics for IGCSE & O level - Proportion (Section 3 - No. 17)

If 'z' varies inversely as the square of 'w', and z=4 when w=2, find z when w=4.
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Explicaţie

z= k/w^2. Thus, 4=k/2^2 or 4=k/4. k=16. Hence, z=16/4^2 = 1

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