Question

3
$3 \times 4 \leqslant 9 \times 12 \leqslant 120$
​

Answer 1

Answer:

left. \begin{array}{c}

\frac{NR}{K}=50\\

0<R\leqslant 35\\

NR\geqslant 65\\

N>0\\

K=24\\

NR\geqslant \text{600 }\left( an\,\,initial\,\,guess \right)\\

\end{array} \right\} \Rightarrow \left\{ \begin{array}{c}

K_{\min}=24\\

N_{\min}=40\\

R_{\max}=30\\

\end{array} \right.

\\

\left. \begin{array}{c}

R_U=\frac{NR}{I}\\

R_D=\frac{NR}{J}\\

K=I+J\\

\end{array} \right\} \Rightarrow \left\{ \begin{array}{c}

I=K-K\alpha =24-24\cdot \frac{1}{4}=18\\

J=K\alpha =24\cdot \frac{1}{4}=6\\

\end{array} \right.