Mathematics for IGCSE & O level - Proportion (Section 1 - No. 27)
If *y* varies inversely as *x*, and *y* is 5 when *x* = 2, then what is the value of *y* when *x* = 10?
1
2
5
25
Explanation
y=k/x, 5=k/2, then k=10; thus y=10/x; if x=10 then y=10/10=1.
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