2(15.00) =30
15.00/2 = 7.5
30+7.5 = $37.5
Answer is $37.5
Since they are FEWER than 30 total cones, the sum of x small cones and y large one must be LESS THAN 30: x+y <30
He needs AT LEAST a dozen (12), so that means that 12 will work or more than 12:
Answer:
1. 50 miles per hour
2.$3.25 (22.75 / 7 = 3.25)
3. Tony's Sewing Store
4. 100 hours (47 / 23.5 = 2, 50 x 2 = 100)
Simplified: 
Restrictions: x CANNOT be 0 because then the denominator would become 0 and would not be possible