Answer: Jenna sold 280 boxes, Becca sold 105 boxes.
Step-by-step explanation: For every 3 boxes B sold, J sold 8 boxes and ended with a total of 385 boxes sold. 3b+8j=385 From how the question is asked, we can assume that each round of sales would equal 11 total sales. (3b+8j=11) Knowing the sales take place in intervals of 11, we can solve the problem by doing 385/11. 385/11=35 Finally, with 35 rounds of sales happening and knowing Jenna sells 8 while Becca sells 3 at each one, all that's left to do is multiply. 8x35=280 3x35=105 To be sure we can check our answer by adding them together, 280+105=385.