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Home > MC2 > Chapter 4 > Lesson 4.3.4 > Problem 4-110


A biologist was sitting near a pond and noticed a large number of dragonflies. He also saw both frogs and fish trying to eat the dragonflies. He counted a total of fish, frogs, and dragonflies. He noticed that there were four times as many dragonflies as fish and that the frogs were five more than twice the number of fish.
Use the 5-D Process to determine how many fish, frogs, and dragonflies the biologist counted.

Use the relationships given in the problem to find out how to relate the
fish, frogs, and dragonflies and form them into equations.

Fish Frogs Dragonflies Total

( ) ( Fish ) Dragonflies
( ) ( Fish ) Frogs

Refer to problems 4-12 and 4-47 for help on the 5-D process.