Problem 17 · 2014 Math Kangaroo
Stretch
Ratios, Rates & Proportions
proportion
On the Kangaroo planet each kangoo-year has 20 kangoo-months. Each kangoo-month has 6 kangoo-weeks. How many kangoo-weeks are in a quarter of a kangoo-year?
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Answer: B — 30
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Hint 1 of 3
First find how many kangoo-weeks fill a whole kangoo-year.
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Hint 2 of 3
Every one of the 20 months holds 6 weeks, so count by sixes (or multiply).
Still stuck? Show hint 3 →
Hint 3 of 3
A quarter means splitting that whole year into 4 equal parts and taking one.
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Approach: find the weeks in a whole year, then split into four equal parts
- A year has 20 months and each month has 6 weeks, so a year is 20 × 6 = 120 kangoo-weeks.
- A quarter is one of four equal pieces, so share 120 into 4 parts: 120 ÷ 4 = 30.
- Answer: 30.
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