Unit 12 · Multi-Step Conditional Reasoning
Five Children — Speed & Accuracy
Lesson 18 of 30
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About this lesson
Five children, two rankings to track — speed and accuracy. Most options could go either way, but one directly contradicts a fact you can prove. The moment you fix Hailey as 1st, the impossible option jumps out.
Chapters
0:00Introduction
0:22Question
1:19Strategy
1:48Step 1: Build the speed ranking
2:30Step 2: Build the accuracy ranking
3:00Step 3: Test the options
3:54Correct answer
Question
Five children did a test with five difficult questions to answer.
- Hailey was faster than Gabriella, but got three questions wrong.
- Adam got all the questions right, but took the longest.
- Natalie finished second, but got two questions wrong.
- Gabriella got more questions right than Natalie, but finished after her.
- Kamilla wasn't as fast as Natalie, but Natalie was not as fast as Hailey.
If all the above statements are true, only one of the sentences below cannot be true. Which one?
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