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Mathematics for IGCSE & O level - Proportion (Section 2 - No. 7)

If *a* varies inversely as *b*, and *a* = 5 when *b* = 4, what is the value of *b* when *a* = 2?
2.5
10
16
20

설명

a=k/b. 5=k/4; k=20; a = 20/b; 2 = 20/b; b=10

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