Answer:
b = 40 - p
42b + 52p = 350
Step-by-step explanation:
Given : No. of small blue pom-pom boxes = b
             No. of large orange pom-poms    = p
            cost of 1 box of blue pom pom = $42
            cost of one  large orange pom-pom box = $52
Solution:
Since we are given that the company has only 40 boxes 
⇒b+p=40
⇒b=40-p
Since cost of 1 box of blue pom pom = $42
So, cost of b box of blue pom pom = $42b
Since,cost of one  large orange pom-pom box = $52
So,cost of p  large orange pom-pom box = $52p
We are also given that the company plan to make $350
⇒42b+52p=350
Hence Option b is correct
b = 40 - p
42b + 52p = 350