If varies partly as and inversely as and 10 whe... - JSS3 Mathematics Variations Question
If 𝑧 varies partly as 𝑥 and inversely as 𝑦, and 𝑧=10 when 𝑥=5 and 𝑦=2, what is 𝑧 when 𝑥=10 and 𝑦=4?
A
5
B
20
C
2.5
D
40
correct option: a
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