Illuminations: Three City Routes

IlluminAir is a small international airline that provides service between Toronto, Ontario; Reston, Virginia; and Doha, Qatar. There are 17 different routes from Doha to Reston, including those that go through Toronto. There are 11 different routes from Reston to Toronto, including those that go through Doha. How many routes are there from Doha to Toronto?

This brainteaser was written by Patrick Vennebush.

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National Council of Teachers of Mathematics

Math Topics

Algebra & Pre-Algebra, Deductive Reasoning & Logical Thinking

Middle School, High School

8th Grade, 9th Grade, 10th Grade, 11th Grade, 12th Grade

Math Puzzles

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Illuminations (National Council of Teachers of Mathematics)

National Council of Teachers of Mathematics

Illuminations works to serve you by increasing access to quality standards-based resources for teaching and learning mathematics, including interactive tools for students and instructional support for teachers.

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