Problem 2 · 2020 Math Kangaroo
Medium
Logic & Word Problems
work-backward
Who is the mother of the daughter of the mother of Lia’s daughter?
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Answer: B — Lia.
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Hint 1 of 2
Read the phrase from the inside out, peeling off one relationship at a time.
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Hint 2 of 2
Notice that 'the mother of Lia’s daughter' is just Lia herself.
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Approach: unwrap the family relations from the innermost phrase outward
- Start inside: 'the mother of Lia’s daughter' is Lia.
- Next: 'the daughter of (Lia)' is a daughter of Lia.
- Finally: 'the mother of (a daughter of Lia)' is Lia again.
- So the described person is Lia, choice B.
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