## Question 15

Which number should replace the question mark?

### Explanation

The number in the middle of the first triangle is found with the folowing calculation: 60 / 20 + 2 = 5
The number in the middle of the second triangle is found with the folowing calculation: : 12 / 3 + 11 = 15
Therefore the question mark should be replaced with the number: 15

### Question statistics

Overview
Question ID: DCKb5DRz
Main category: Numerical Reasoning
Sub category: Math triangles
Difficulty Level: 15What is item difficulty?
Nr of times answered: 2402
Average IQ of people who answered this question: 112.68
Percentage of answers correct: 48.00%
Item Response Theory (IRT)What is Item Response Theory?
Item difficulty: 15 / 20What is item difficulty?
Discrimination: 1.76 What is item discrimination?
Point of Maximum Information: 115.58 What is Point of Maximum Information?
##### Item Characteristic Curve (ICC)
Distractor AnalysisWhat is distractor analysis?
Average IQ of people who gave the correct answer: 116.03
Average IQ of people who gave an incorrect answer: 109.27

Time spent: you used 15 seconds to answer this question