Problem 10 · 2016 Math Kangaroo
Medium
Arithmetic & Operations
careful-counting
Together, Paul and Josef are 12 years old. How old will they both be together in four years’ time?
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Answer: E — 20
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Hint 1 of 2
You don't need each boy's age — only their combined age.
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Hint 2 of 2
In four years, both ages grow, so the total grows by 4 twice.
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Approach: track the combined age
- Together they are 12 now.
- In four years each is 4 years older, so their combined age rises by 4 + 4 = 8.
- Together they will be 12 + 8 = 20.
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