It would be 1/3 because there are three ingredients. Therefore, if he is allergic to one of everything in each category, there are 3/10 things he is allergic to.
To do this problem you use is/of=percent/100
So:
320/750=x/100
cross multiply
32,000=750x
divide both sides by 750
x=42.66 repeating
ANSWER: X=42.66 REPEATING
Answer: D
Step-by-step explanation:

Answer:
Answer down below :)
Step-by-step explanation:
The volume of the rectangular prism is:
20 x 9 = 180cm^2
The volume of the triangular prism is
6 x 9 x 1/2 = 27cm^2
I'm sorry, that is all I can do, but the total volume would be 180 + 27 + the cylinder's volume. Have a nice day :)