Question 18

Which number should replace the question mark?

Explanation

The scale is balanced. This is the case if the distances * weights are the same on both sides of the scale: A * weigth 1 = B * weight 2.

90 * 7.5 = ? * 3
==> 675.0 = ? * 3
==> 675.0 / 3 = ?
==> ? = 225

Question statistics

Overview
Question ID: TQoQuGNj
Main category: Numerical Reasoning
Sub category: Weight Scales
Difficulty Level: 16What is item difficulty?
Nr of times answered: 1053
Average IQ of people who answered this question: 120.74
Percentage of answers correct: 46.06%
Item Response Theory (IRT)What is Item Response Theory?
Item difficulty: 16 / 20What is item difficulty?
Discrimination: 2.33 What is item discrimination?
Point of Maximum Information: 123.70 What is Point of Maximum Information?
Item Characteristic Curve (ICC)
Distractor AnalysisWhat is distractor analysis?
Average IQ of people who gave the correct answer: 123.79
Average IQ of people who gave an incorrect answer: 117.36
Response Time Analysis
Optimal time to spend on question: 41 seconds What is the optimal response time?
Optimal time to spend on question

Time spent: you used 121 seconds to answer this question