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Linear Inequality Word Problems - Harder

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This video is for the redesigned SAT which is for you if you are taking the SAT in March 2016 and beyond.

Linear Inequality Word Problems — Harder example
Ngozi needs to send out 300 wedding invitations. In 1 minute, she can put 6 invitations into envelops and apply stamps to them. It takes her a minimum of 50 seconds to address each invitation by hand. If n represents the number of invitations Ngozi can prepare for mailing in 180 minutes, which of the following inequalities best models the situation described above?
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