Math puzzle involving arithmetic operations to solve a sequence from start to end.
A math puzzle diagram with three columns of circles connected by arrows, showing arithmetic operations. The left column starts with 5 and ends with a circle labeled "CHECKPOINT" and "END." The middle column has a starting circle with a value of 20 and ends with a circle labeled "CHECKPOINT." The right column starts with 20 and ends with 0. Operations include addition, subtraction, multiplication, and division.