Problem 2 · 2022 Math Kangaroo
Easy
Arithmetic & Operations
arithmetic-series
On every birthday Maria gets as many teddies as the age she turns: 1 teddy on her first birthday, 2 teddies on her second birthday, and so on. How many teddies does Maria have in total the day after her sixth birthday?
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Answer: C — 21
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Hint 1 of 2
On each birthday she gets a number of teddies equal to her age that day.
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Hint 2 of 2
Add up the teddies from birthday 1 through birthday 6.
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Approach: add the gifts from each birthday
- Birthdays 1 to 6 give 1, 2, 3, 4, 5 and 6 teddies.
- Add them up: 1 + 2 + 3 + 4 + 5 + 6 = 21.
- So the day after her sixth birthday she has 21 teddies (choice C).
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