Total = 40 Medals.

Explanation:
Let us consider  G = Gold , S = Silver and B = Bronze

as per the given equation,

S + B = 33
G + B = 29
G + S = 18

Solving these Equations we get,
G = 7, S = 11 and B = 22

Gold= 7 ; Silver= 11; Bronze= 22

Total coins= 40

#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$