Cyberchase: How Many Gleamers?
Math → Algebra → Substitution
The CyberSquad's ship needs 40 glows of power to take off. The group learns that Hacker changed the gleamer's power output from six to four, so they use algebra to calculate how many gleamers they'll need to reach the minimum power output of 40 glows. They determine that they'll need 10 gleamers, or three additional gleamers, to take off before the island turns inside out.