I’m pretty sure it is B or C
Hi there!
First we need to remember the following.

Now substitute both of the formulas.

Work out the parenthesis.

And finally collect terms.

~ Hope this helps you!
I think it would be like how many times does 5 go into 48.. and that would be 9 and 3/5
You have to divide 400 by 5. That will equal 80. Since the ratio is 3:2 Just multiply 3 by 80 then 2 by 80! :-)
You can check it by simplifying it again.
Do you need help? I can assist you if so.