Problem 10 · 2012 Math Kangaroo
Medium
Algebra & Patterns
substitution
3 balloons cost 12 cents more than 1 balloon. How much does 1 balloon cost?
Show answer
Answer: B — 6 cents
Show hints
Hint 1 of 2
Three balloons cost the same as one balloon plus 12 cents, so what do the two extra balloons cost?
Still stuck? Show hint 2 →
Hint 2 of 2
Two balloons cost 12 cents; halve that for one balloon.
Show solution
Approach: compare three balloons with one balloon
- 3 balloons cost 12 cents more than 1 balloon, so the extra 2 balloons cost 12 cents.
- Then 1 balloon costs 12 / 2 = 6 cents.
- So one balloon costs 6 cents.
Mark:
· log in to save