Averages, weighted average, simple arithmetic mean problems : Ascent - CAT XAT classes, mock cats

Ascent Education - TANCET, MBA Entrance Training Classes
 
Latest News LATEST NEWS
Ascent Success Stories
TANCET 16 Classes @ ChennaiXAT 16 Classes @ Chennai
Connector
Ascent's Courses
 
Contact Us
+91 44 4500 8484
+91 96000 48484
You are here: Home » CAT Questions » Averages, Mean » Weighted Average

Arithmetic Mean Questions, Answers - CAT 2016 Maths Preparation

Question 4 the day : August 19, 2003
The question for the day is from the topic of Averages. It is a weighted average question and helps understand the basic concepts in averages and weighted average.

Question
When a student weighing 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students?
  1. 57
  2. 56.8
  3. 58.2
  4. 52.2
Correct Answer is 57 kgs. Choice (1) is right.

Explanatory Answer

Let the average weight of the 59 students be A.
Therefore, the total weight of the 59 of them will be 59A.

The questions states that when the weight of this student who left is added, the total weight of the class = 59A + 45
When this student is also included, the average weight decreases by 0.2 kgs.
= A - 0.2
=> 59A + 45 = 60A - 12
=> 45 + 12 = 60A - 59A
=> A = 57.


More Questions on Arithmetic Mean, Averages

XLRI XAT TANCET Practice Question Samples



 
Quick Links
TANCET Questionbank  
TANCET MBA MCA Practice Questions with detailed explanation and shortcuts. TANCET Sample Questions

GMAT Math Books  
Comprehensive study material for GMAT Quant. 1800+ questions. GMAT Quant Books

Staying outside India?  
Ascent offers CAT Correspondence Course for those who reside abroad. CAT Correspondence Outside India

CAT classes @ Chennai  
CAT 2010 intensive batch starts Jan 23, 10. Faculty includes IIM graduates. Personal attention. Online Mock CATs & Analysis. CAT Math and DI crash course

CAT GDPI Course  
Group Discussion and Personal Interview training for IIMs and other top B schools. CAT GD, PI Course

GMAT Math Lesson Book | SAT prep | GRE Classes @ Chennai | GMAT Coaching @ Chennai | TANCET Mailing List
© 2002 - 17 ASCENT Education all rights reserved. Terms & Condition | Privacy Policy