Mathematics for IGCSE & O level - Proportion (Section 1 - No. 33)
If *a* is inversely proportional to *b*, and *a* is doubled, what happens to *b*?
*b* is halved
*b* is doubled
*b* is quadrupled
*b* stays the same
解释
Since a = k/b, or ab=k. If a is doubled, 2a*b=k, or a*b/2 = k, therefore, b is halved