Final answer:
To find out how many strawberries 5 boxes contain, divide the total strawberries by the number of boxes and then multiply it by the desired number of boxes.
Step-by-step explanation:
To find out how many strawberries 5 boxes contain, we can start by finding the number of strawberries in one box. Rachel divided 105 strawberries equally into 7 boxes, so each box contains 105/7 = 15 strawberries. Now, to find the number of strawberries in 5 boxes, we can multiply the number of strawberries in one box by 5. Therefore, 5 boxes will contain 15 x 5 = 75 strawberries.