Billy needs 170 dollars for a pair of shoes. His parents gave him 50 dollars. He makes 15 dollars a day at his job. How many days would he need to work to buy

8 days.

Step-by-step explanation:

To find how many days Billy needs to work, we can first subtract what he has ($50) from what he needs ($170) to get:

170 - 50 = 120

Next, we can divide 120 by the number of dollars he can earn each day ($15) to get:

120 ÷ 15 = 8

Therefore, he must work 8 days.

Hope this helps :)