Brain Teasers
Double the Contrary
Lucy and Lory are sisters. They are special. They usually tell the truth in all cases, but when recalling something her sister has said, then they twist it a little bit.
For instance, when referring to something Lory had said, Lucy always says quite the contrary: "Lucy, look, the sky is beautiful." "Did you say the sky is ugly?".
In Lory's case, when referring so something Lucy said, She always doubles any quantity that appears in the sentence: " Hey, Lory, I found two flowers." "Mom, Lucy says she found four flowers".
Some day they were talking about a friend of theirs and mom came by. She heard this:
- As you say, Jorge is the younger brother.
- But you said his brother was 20 years younger.
- No, it was you who said that his brother was three times Jorge's age.
- Well, that is not important. The important thing is that, as you said, Jorge is 30 years old.
What are Jorge's and his brother's ages?
For instance, when referring to something Lory had said, Lucy always says quite the contrary: "Lucy, look, the sky is beautiful." "Did you say the sky is ugly?".
In Lory's case, when referring so something Lucy said, She always doubles any quantity that appears in the sentence: " Hey, Lory, I found two flowers." "Mom, Lucy says she found four flowers".
Some day they were talking about a friend of theirs and mom came by. She heard this:
- As you say, Jorge is the younger brother.
- But you said his brother was 20 years younger.
- No, it was you who said that his brother was three times Jorge's age.
- Well, that is not important. The important thing is that, as you said, Jorge is 30 years old.
What are Jorge's and his brother's ages?
Hint
Looks like Lucy talked first.Answer
Jorge is 15 years old, and his brother is 5 years old.Lucy is the one that talks first, so Jorge is the older, not the younger.
Then Lory talked, so Jorge's brother is 10 years younger, not 20.
Again Lucy, so it was Jorge who was 3 times his brother's age.
And last, Lory says that Jorge is 30 years, meaning 15 is the actual age.
So, Jorge is 15, his brother 15-10 = 5, and Jorge is 3 times as old as his brother (3*5=15).
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