There are really only two different shades of what I think is pink.
1/3 is equal to 2/6 which is equal to 3/9
1/2 is equal to 2/4 which is equal to 4/8
The bolded ones are the original mixtures given.
Start with 1/3 Multiply top and bottom by 2 and you get 2/6
When you multiply top and bottom of 1/3 by by 3 you get 3/9
Use the same idea for 1/2