Caribou Contest May 2016, grade 9/10, q.15

Everyone can do maths...and enjoy it! This is a video tutorial for the Caribou Contest, the biggest worldwide online math contest for grades 3 to 12. Here, the solution to question
https://cariboutests.com/question.php?con=182&q=15
is shown.

For more information on Caribou Contests and other math-related fun visit our facebook page: http://www.facebook.com/cariboucontests/

For free online practise tests go to
https://cariboutests.com/test/practice_test_login.php

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