Since Ponce weighs 10 pounds lighter than Jalen, he weighs 160-10 = 150 pounds.
The sum of Jalen and Ponce's weight is 150+160 = <<150+160=310>>310 pounds.
Ishmael is 20 pounds heavier than Ponce, meaning he weighs 150+20 = <<20+150=170>>170 pounds.
The total weight of the three is 310+170 = <<310+170=480>>480 pounds.
The average weight of the three is the total weight divided by their number, which totals 480/3 = <<480/3=160>>160 pounds.
#### 160