A professor hires two aides, assigning them the tasks of reading student papers and of typing lecture notes on a computer. One of the aides, Ben, can read 1 page of a student paper per minute or type 50 words of lecture notes per minute, and the other aide, Ann, can read 3 pages of a student paper per minute or type 60 words of lecture notes per minute.

Jackie went to the grocery store to pick up yogurt, bread, and apples. first, she picked up a hand basket for carrying her groceries, and then she searched the store. after finding what she needed, she stood in a check-out line. then, the cashier put her items in a plastic bag, and soon after, jackie left the store. as readers of this event, we understand that jackie paid for the groceries, even though it wasn't mentioned, because we are relying on a grocery store