A simple set of puzzles designed to help students practice solving algebraic proportions. By solving for each variable, students will answer the question "Where does at least 50% of earth's oxygen come from?".
Bonus Puzzle: By solving algebraic equations using percentages, students will answer the question: "Where does at least 33% of the earth's oxygen come from?".
Puzzle contains 13 algebraic proportion problems. Bonus puzzle contains 10 percentages problems.
Includes answer key.