To determine how many Smart Phones Yoshi can buy, we need to know the price of each Smart Phone. If you can provide that information, I will be able to help you calculate how many he can afford with his $314 budget.
For example, if each Smart Phone costs $60, we would divide $314 by $60 to find out how many he can buy:
Let me know the price of the Smart Phones so I can give you the correct answer!