Let x represent the cost of the cheeseburger, y represent the cost of the fries and z represent the cost of the drink.
The cheeseburger was three times the price of the fries. Hence:
x = 3y
x - 3y = 0 (1)
The drink and the fries were the same price, hence:
y = z
y - z = 0 (2)
The entire meal cost $12.50, hence:
x + y + z = 12.50 (3)
Solving equations 1, 2 and 3 simultaneously gives:
x = 7.5, y = 2.5, z = 2.5
The cheeseburger cost $7.5, the fries cost $2.5 and the drink cost $2.5.
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