Question 397692
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Hi
Let x represent how many boxes of cereal can it fill per hour
Question sets up the proportion***
 {{{(5145/.7) = (x/1)}}}  |cross multiplying to solve for x
        .7x = 5145
          x = 7350, boxes of cereal that can be filled per hour

Let x represent long it would take them to deliver 145 papers
 {{{(100/2) = (145/x)}}}  |cross multiplying to solve for x