[Video] Q31: A scale drawing of a room uses the scale 2 centimeters = 1 foot. in the drawing, one wall has a length of 22 centimeters. what is the actual length, in feet, of this wall?

Explanation for Question 31 From the Math (Calc) Section on the 2018 May Sat

Question 31 says a scale drawing of a room uses the scale. 2 Two centimeters is equal to one foot 3 in the drawing. One wall has a life of 22 centimeters. 4 What is the actual length in feet of this wall? 5 So I'm going to use these measurements to set up a fraction. 6 I know that two centimeters is equal to one foot, 7 which means that 22 centimeters is equal to X 8 fee. And now I can cross multiply to solve for X. 9 So I have two X is equal to 22 times one or just 22. 10 And when I divide both sides by two, I get X is equal 11 to 11, which is our final answer.