We would set up a ratio to compare the two proportions. 65 g for 2000 calories is to what for 1600 calories.
x= fat g for 1600 calorie diet
65/2000= x/1600
cross multiply
(2000)(x)= (65)(1600)
multiply
2000x= 104,000
divide both sides by 2000
x= 52 g
ANSWER: 52 g of fat per day is the daily limit for a 1600 calorie diet.
Hope this helps! :)