Problem 12 · 2023 Math Kangaroo
Medium
Spatial & Visual Reasoning
reflectionclock-calendar
The picture of a digital watch is seen in a mirror, as shown. Which picture shows the watch in the mirror 30 minutes later?
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Answer: D
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Hint 1 of 3
The picture is already flipped, so first flip it back left-to-right to read the real time the watch shows now.
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Hint 2 of 3
Add 30 minutes to that real time the normal way.
Still stuck? Show hint 3 →
Hint 3 of 3
The answer choices are mirror pictures too, so flip your new time left-to-right again and match it.
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Approach: un-mirror, add 30 minutes, then mirror again
- The picture is what the watch looks like in a mirror, so flip it left-to-right to read the actual time it shows now.
- Add 30 minutes to that real time.
- The answer choices are themselves mirror images, so mirror the new real time the same way to see how it looks in the mirror.
- The matching mirrored picture is D.
Mark:
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