Problem 6 · 2025 Math Kangaroo
Medium
Logic & Word Problems
caseworksum-constraint
The picture on the right shows the menu of a burger restaurant. The rain has washed away some of the numbers. The burgers are ordered by price. Which of the following prices was on the board?
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Answer: B — 5.50
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Hint 1 of 2
The prices go up from top (3.70) to bottom (6.80); use the visible last two digits.
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Hint 2 of 2
Find whole-euro values that keep the list strictly increasing and fit the shown cents.
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Approach: fit increasing prices to the visible digits
- Prices rise from 3.70 to 6.80, and the visible cents are .30, .60, .50, .10 going down.
- Because .50 is less than .60, ‘cheesy’ must jump to a higher whole euro, and similarly for ‘double’.
- The only increasing fit is 4.30, 4.60, 5.50, 6.10.
- Among the choices, 5.50 (the cheesy price) is the one that appears.
Mark:
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