Yes Diane will have enough money to buy sneakers because she will have 420 dollars in total. I got that by multiplying 5x12, which gives me 60. And than I multiply 60 by 7(days in a week). And i divided 420 by 2 and got 210.
She will still have 210 dollars for etc part. Hope this helps! If you have anymore questions please ask me. I am here to help you and others. Stay safe and have a great day!