Hello there. To solve this question, we'll have to remember some properties about fractions.
Given the diagram, we have to determine how many of the total it represents and find two fractions that multiplied gives us what it represents.
Considering we have 15 rectangles and 5 of them are filled, we say that we have
5 of 15
or
1 of 3
And the fraction is:
5/1 * 1/15
or
1/1 * 1/3
It is, we have 5 rectangles colored for each of the 15 rectangles
Now, considering we have to determine how many out of the red rectangles are the blue ones, we get
2 of 5
and a fraction of
2/1 * 1/5
It is, 2 blue colored rectangles for each 5 red colored rectangles.