Every morning when Aldo, Brenda, and Cory line up at the bus stop, they can choose between two busses — one yellow and one blue.
Which of the three kids always takes the same bus? What color is it?
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2 comments:
Corey, the blue bus. Are you coming Saturday night? You said you were at the bar the other night and that Y was out of town...You haven't RSVP'd....and I'm really hoping you'll be there as Jing-a-ling!
Here is the answer....
Aldo always takes the blue bus.
STRATEGY: Make a table that shows the choices for Aldo. He can either take yellow or blue. If he takes yellow, there are two options for Brenda and Cory. If he takes blue, there are four choices for Brenda and Cory.
Aldo Brenda Cory
A yellow yellow yellow
B yellow blue blue
C blue blue blue
D blue yellow yellow
E blue yellow blue
F blue blue yellow
Now go back to the information in the problem and eliminate the impossible cases. Number 2 makes case A and E impossible, so cross them out. Number 3 makes case B impossible, so cross that out. That leaves only cases D and F. Aldo takes the blue bus in both.
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