Answer:
30 = 80 %
40= 20 %
Step-by-step explanation
I'm sorry for not writing how to do it but it's something like if 30 = 100 then if we had 40 occupying 20 percent of that acid then we will get 32 percent
i dont know im right but i think is 7
B
Step-by-step explanation:
Bc dont take my word repost this