Problem 11 · 2025 Math Kangaroo
Medium
Arithmetic & Operations
total-then-divide
Anna, Bonnie and Caspar have some kangaroo cookies on their plates (see picture). There are 15 more cookies left over. They share these out so that each child ends up with the same number of cookies on their plate. How many cookies are added to Anna's plate?
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Answer: D — 6
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Hint 1 of 2
First find how many cookies there are altogether, then share them equally among the three children.
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Hint 2 of 2
Subtract the cookies Anna already has from her fair share.
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Approach: find the equal share, then see how many Anna still needs
- The plates already hold 3 (Anna) + 4 (Bonnie) + 5 (Caspar) = 12 cookies.
- With the 15 extra there are 12 + 15 = 27 cookies in all.
- Shared equally, each child should have 27 ÷ 3 = 9 cookies.
- Anna has 3, so she gets 9 − 3 = 6 more, option D.
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