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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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