model 6 find average of excluded number Practice Questions Answers Test with Solutions & More Shortcuts
average PRACTICE TEST [9 - EXERCISES]
model 1 basic average questions
model 2 average of consecutive numbers
model 3 twice, thrice, one third etc. of numbers
model 4 find nth average from 1st & last number
model 5 find new average from error
model 6 find average of excluded number
model 7 average on ages/weight
model 8 find monthly income
model 9 average on cricket/exam
Question : 16 [SSC SO 2005]
There were 35 students in a hostel. If the number of students is increased by 7 the expenditure on food increases by Rs.42 per day while the average expenditure of students is reduced by Rs.1. What was the initial expenditure on food per day ?
a) Rs.432
b) Rs.442
c) Rs.400
d) Rs.420
Answer »Answer: (d)
Suppose the initial expenditure per day = Rs. x
⇒ $x/35$ - ${x+42}/42$ = 1
⇒ ${6x-5x-210}/210 = 1$
⇒ x = 210 + 210 = Rs. 420
Question : 17
The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new average becomes 47. The new observation is
a) 56
b) 50
c) 58
d) 46
Answer »Answer: (a)
Let the new observation be x. Then,
${x+6×45.5}/7$= 47
⇒ x + 273 = 47 × 7 = 329
⇒ x = 329 – 273 = 56
Aliter : Using Rule 24,
Here, x = (47 – 45.5) = 1.5, n = 6
New observation = Average + x (n + 1)
= 45.5 + 1.5 (6 + 1)
= 45.5 + 10.5 = 56
IMPORTANT quantitative aptitude EXERCISES
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Basic Average Questions Practice Test, Shortcuts, Tricks, PDF »
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New Average Aptitude MCQ Average of Consecutive Numbers »
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Top 99+ Average Aptitude: Twice, One Third of Numbers MCQ »
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New +99 Average Aptitude MCQ Find nth Average of Numbers »
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99+ Average Aptitude Find New Average from Error MCQ Test »
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Top 99+ Aptitude MCQ Test on Average With Excluded Number »
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Top 99+ Aptitude Average on Ages & Weights MCQ Test Quiz »
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Top Aptitude Average MCQ Find Monthly Income for Average »
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Top 149+ Aptitude Average on Cricket & Exam MCQ Test Quiz »
model 6 find average of excluded number Shortcuts »
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Click to Start..average Shortcuts and Techniques with Examples
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model 1 basic average questions
Defination & Shortcuts … -
model 2 average of consecutive numbers
Defination & Shortcuts … -
model 3 twice, thrice, one third etc. of numbers
Defination & Shortcuts … -
model 4 find nth average from 1st & last number
Defination & Shortcuts … -
model 5 find new average from error
Defination & Shortcuts … -
model 6 find average of excluded number
Defination & Shortcuts … -
model 7 average on ages/weight
Defination & Shortcuts … -
model 8 find monthly income
Defination & Shortcuts … -
model 9 average on cricket/exam
Defination & Shortcuts …
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