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From a crushed quartz sample, the fraction less than 5 m m must be removed by screening. The feed sample contains 3 0 % of

From a crushed quartz sample, the fraction less than

5 m m

must be removed by screening. The feed sample contains

30 %

of minus

5 m m

material. After screening, the oversize fraction contained

85 %

of plus

5 m m

size while the undersize fraction contained

12 %

of plus

5 m m .

Determine the efficiency of the screen.

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