inequation
[tex]750 - 70p \leqslant 450[/tex]
then
[tex]750 - 450 \leqslant 70p[/tex]
[tex]300 \leqslant 70p[/tex]
[tex] \frac{300}{70} \leqslant p[/tex]
[tex]4.29 \leqslant p[/tex]
then the minimum whole number of passengers who need to get off elevator to meet the weight requirement is about 5 passengers.
