a baseball and a bat cost $110 if the bat costs $100 more than the ball

Answer: 105$

Solution:

#Puzzle_answer: 105$

Let us assume that the cost of phone case is x

Therefore, cost of phone is x+100

x+(X+100)=110

2x=10

x=5

Therefore,

Phone cost =5+100 =105

Phone cost is 105$