Let's say his father's weight is f(x). So, here's your expression:

You could simplify if you'd like to:

And that's your simplified expression!
Im pretty sure your answer is D
12 out of 36 is the same as 12/36
Both 12 and 36 are divisible by 12.
12/36 = (1 * 12)/(3 * 12) = 1/3 * 12/12 = 1/3 * 1 = 1/3
Answer: 1/3
Analysis:{because the number of rulers is exactly three scales}
so a scale represents a number of
(24÷3=8)
missing information in the space around the chart 40,32,24,16,8.