Problem 8 · 2021 Math Kangaroo
Medium
Arithmetic & Operations
careful-counting
In the Kangaroo constellation, all stars have a number greater than 3 and their sum is 20. Which is the Kangaroo constellation?
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Answer: B
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Hint 1 of 3
Two rules must both be true: every star number is bigger than 3, and they add up to 20.
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Hint 2 of 3
First cross out any picture that has a star showing 3 or less.
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Hint 3 of 3
From the ones left, add the star numbers and keep the picture that totals 20.
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Approach: use both rules to pick the picture
- First throw away any constellation that has a star numbered 3 or smaller.
- From the pictures that are left, add up all their star numbers.
- The one whose stars are all bigger than 3 and add to 20 is option B.
Mark:
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