Question

What are the answers to A and B?

Answer 1

A) 28 are guppies
Remember that "of" in math always means x or times or multiply.
So 4/9 x 63 are guppies
4/9 x 63= 28

B) 35 are not guppies
The ones remaining are not guppies. 
63-28= 35

Hope this helps :)