You should __________ when to say __________.

Two straight lines pass through the origin (x₀, y₀) = (0, 0). One of them passes through the point (x₁, y₁) = (1, 3) and the other passes through the point (x₂, y₂) = (1, 2). What is the area enclosed between the straight lines in the interval [0, 1] on the x-axis?

If

p : q = 1 : 2

q : r = 4 : 3

r : s = 4 : 5

and u is 50% more than s, what is the ratio p : u?

Given the statements :

$$\bullet$$ P is the sister of Q.

$$\bullet$$ Q is the husband of R.

$$\bullet$$ R is the mother of S.

$$\bullet$$ T is the husband of P.

Based on the above information, T is _________ of S.