Gathering the data
4g each packet of sugar.
20 fl oz ⇒ approximately 600 ml
65 g of sugar (label info)
1) If there's 65 g of sugar in a 20 fl oz
65 ÷ 4 = 16.25 At least 17 packets of sugar
2) Let's set a proportion
65 g of sugar is equivalent to approximate 72.28ml
72.28 -----------x
600-------------100
x=12% of sugar.