Answer:
The answer is 53 1/3
Explanation:
how you do it is you first do 300/60=5
then you do 100/40=2.5
you add them to get 7.5
after then you do 400/7.5=53 1/3
that's the answer!
I hope you found this useful
(I submitted it onto the RSM page because I do RSM and it said it was correct. If it isn't then your thing has a problem)