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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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