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If the feed flow rate $($F$)$ is $300\frac{t}{h}$ and the feed contains $35\%$ of undersize. Calculate:

A$.$ Mass of undersize in the feed $[$F$(1-$F$)$:

B$.$ The mass of oversize in the feed $[$fF$]$

C$.$ The screen efficiency if the undersize stream contains $90\%$ of minus $2$ inch while the oversize stream contains $95\%$ of plus $2$ inch.

$($See the class notes$)$