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2020 Math Kangaroo

Problem 1

Problem 1 · 2020 Math Kangaroo Easy
Spatial & Visual Reasoning sequence-of-figures

A mushroom grows a little bigger every day. Over five days Maria took a photo of this mushroom, but she put the photos in the wrong order (see picture). Which order of the photos shows the mushroom growing, from left to right?

Figure for Math Kangaroo 2020 Problem 1
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Answer: A — 2-5-3-1-4
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Hint 1 of 2
A mushroom only gets bigger from one day to the next, so order the photos from smallest cap to largest cap.
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Hint 2 of 2
Find the tiniest mushroom and read the labels in growing order.
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Approach: order the photos from smallest to largest mushroom
  1. The mushroom grows every day, so the correct order goes from the smallest cap to the biggest, fully opened cap.
  2. Reading the photo labels from smallest to largest gives the sequence in choice A: 2-5-3-1-4.
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