Answer:
17.50 
 
Step-by-step explanation: 
 
20% of x = 3.50 
 
(20/100) x = 3.50 Divide top and bottom of the left number by 20 
 
(20÷20) / (100÷20) * x = 3.50 
 
(1/5) x = 3.50 Multiply both sides by 5 
 
x = 3.50 * 5 
 
x = 17.50
The meal cost $17.50
HOPE IT HELPS!~ UwU