Adventurers and River Puzzle

by Thinker · Published October 11, 2017 · Updated October 11, 2017

Puzzle of the Day 2077 : Adventurers and River Brain Teaser Riddle

Puzzle 2077 thinkwitty.com - Adventurers and River Riddle

Four adventurers (Ant, Bird, Cat and Dog) need to cross a river in a small canoe.
The canoe can only carry 100kg. Ant weighs 90kg, Bird weighs 80kg, Cat weighs 60kg and Dog weighs 40 kg, and they have 20kg of supplies.

How do they get across?