Question on: JSS3 Mathematics - Variations

If ๐‘ฆ varies inversely as ๐‘ฅ and ๐‘ฆ=20 when ๐‘ฅ=4, find ๐‘ฆ when ๐‘ฅ=5.

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Given ๐‘ฆ=๐‘˜/๐‘ฅ, substituting the given values:

20=๐‘˜/4

Solving for ๐‘˜:

๐‘˜=20โ‹…4=80

Now, find ๐‘ฆ when ๐‘ฅ=5:

๐‘ฆ=80/5=16

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