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- [Instructor] Margo classified
her favorite paintings hanging in a museum by both
size and dominant color. The results are in the table above. We have this table. So we have dominant color. We have large size, small size. We have a bunch of blanks here. I'm guessing we're gonna have
to fill some of these out. Margo found that, okay
this is interesting, Margo found that 1/4 of her favorite large paintings were blue. How many of Margo's
favorite paintings have red as the dominant color? So we wanna figure out how many of her favorite paintings, whether it's large or small,
have red as the dominant color. So we wanna figure out the total number that have red as the dominant color. And so to figure this out,
I think we're gonna have to figure out some of these other blanks. And let's start with the information that they actually gave us. Margo found that 1/4 of her
favorite large paintings, so this is her favorite large paintings. This right over here
is the total favorite. This is the total
favorite large paintings. 1/4 of this, 1/4 of her favorite
large paintings are blue. So 1/4 of this gives us five. So 1/4 of what is equal to five, or five times four is what? Well, this just needs to be 20. Five out of 20 is the same thing as 1/4. And if we know that, then we can start to fill in some of these other blanks. So if we have a total
of 20 large paintings and five are blue, then 15
are going to have to be red, because the red large ones
plus the blue large ones is going to add up to 20. Now, if you have 15 red large and if you have four red small, the total number of red
is 15 plus four is 19. So 19 of Margo's favorite
paintings have red as the dominant color, 19.