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If ` qr : pr : pq = 1:4:7," then find " p/(qr) : q/(pr)`.

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If ` qr : pr : pq = 1:4:7," then find " p/(qr) : q/(pr)`.
A. ` 4 : 1`
B. ` 1 : 4`
C. ` 1 : 16`
D. ` 16 : 1`
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Correct Answer - D
Simplify the required ratio.
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