What I Know Direction: Write only the answer. 1. Write True or False. 1. The extremes in the proportion n: m = x:y is n and y. 2. The means in the proportion 3 : 4 = 15 : 20 is 4 and 20. . In the proportion 2 : 3 = 6:9, the third term is 3. . There are 3 apples and 5 oranges in a basket. If there are here are also 10 oranges. In a group of boys and girls of the Grade 5 class, 12 are g oys. The ratio of pupils to the number of girls is 17 : 12.