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If varies inversely as and 20 when 4 find when 5 - JSS3 Mathematics Variations Question

If 𝑦 varies inversely as 𝑥 and 𝑦=20 when 𝑥=4, find 𝑦 when 𝑥=5.

Given 𝑦=𝑘/𝑥, substituting the given values:

20=𝑘/4

Solving for 𝑘:

𝑘=20⋅4=80

Now, find 𝑦 when 𝑥=5:

𝑦=80/5=16

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