The maximum number of grams of fat (F) that should be in a diet varies directly as a person’s weight (W). A person weighting 120 lb should have no more than 80 g of fat day. What is the maximum daily fat intake for a person weighing 66 pounds?
Solution:-
Since the number of grams of fat (F) in a diet varies directly as a person weight (W), you can use the form:
F = kW.
To find the variation constant, substitute 80 for 80 F and 120 for W and solve for k.
80 = k * 120.
Solve for k.
k = 
The equation of variation is F = W.
Now, use the equation of variation to find the maximum number of grams of fat intake for a person weighing 66 lb.
F = * 66
F = 44
A person weighting 66 lb will have a maximum daily fat intake of 44 g.