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Mathematics for IGCSE & O level - Proportion (Section 2 - No. 10)
If *a* varies inversely with the square of *b*, and *a* = 4 when *b* = 2, find the value of *a* when *b* = 4.
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a = k/b^2; 4=k/2^2; k=16. a=16/b^2; a=16/4^2=1
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