Inverse-square proportion under a percentage change

Inverse-square proportion under a percentage change

Secondary 2
TGM Original Questions

It is given that \(y\) is inversely proportional to the square of \(x\), and \(y=20\) for one value of \(x\). When \(x\) is increased by 25%, find

  1. the new value of \(y\),
  2. the percentage decrease in \(y\).

Solution:

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Answer:(a) \(12.8\); (b) \(36\%\).

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