Unit 2 · Schedule and Timetable Matching
Which Robot Pack Completes His Set?
Lesson 12 of 12
About this lesson
John needs a red and a green robot. He can buy a pack of three, and his friend will swap a pink robot for a green one. Which pack lets him walk away with both colours he needs? The trick is recognising the two-step route: get red from the pack directly, and use the pink in the same pack to trade for green.
Chapters
Question
John is collecting a set of toy robots based on his favourite television program. The robots come in different colours and John still needs the red and green robots to complete his set. The local shop has an offer where they will sell any of the following packs of three robots for $10.
| pack | robot 1 | robot 2 | robot 3 |
|---|---|---|---|
| pack 1 | red | blue | yellow |
| pack 2 | red | yellow | pink |
| pack 3 | green | pink | purple |
| pack 4 | blue | orange | pink |
John has a friend who has a spare green robot and will swap it for a pink robot.
Which pack should John buy to be able to complete his set?
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