If he lowers his sugar consumption by 20% , he'll still consume 80% of the amount he consumes now.
80% means 0.80
"of" means "times"
0.80 x 67.5 pounds = 54 pounds
Each track jock will have to make do with only 54 pounds of sugar next year.
That's an average of a meager 67 grams of sugar every day. Can they do it ?