Answer:
49
Step-by-step explanation:
sum the parts of the ratio, 3 + 5 + 7 = 15 parts
divide cups of salsa by 15 to find value of one part of the ratio
105 ÷ 15 = 7 ← value of 1 part of the ratio , then
7 parts = 7 × 7 = 49
49 cups of tomato are required
