model 6 operations of consecutive numbers (odd, even, square, etc.) Practice Questions Answers Test with Solutions & More Shortcuts
number system PRACTICE TEST [6 - EXERCISES]
model 1 basic number system
model 2 divisibility, multiples, add and subtract based number system
model 3 fraction of numbers
model 4 finding unit place of a number
model 5 smallest and largest fraction/numbers
model 6 operations of consecutive numbers (odd, even, square, etc.)
Question : 16 [SSC CHSL 2015]
Two positive whole numbers are such that the sum of the first number and twice the second number is 8 and their difference is 2. The numbers are :
a) 4,2
b) 7,5
c) 6,4
d) 3,5
Answer »Answer: (a)
Let the numbers be x and y.
According to the question,
x + 2y = 8 .... (i)
x – y = 2 ....... (ii)
By equation (i) – (ii),
2y + y = 8 – 2
3y = 6; y = 2
From equation (ii),
x – 2 = 2 ; x = 4
Question : 17 [SSC CGL Tier-I 2015]
What is the arithmetic mean of first 20 odd natural numbers ?
a) 22
b) 19
c) 17
d) 20
Answer »Answer: (d)
Sum of first n odd natural numbers = $n^2 = (20)^2$ = 400
Required average = $400/20$ = 20
Question : 18 [SSC CGL Tier-I 2016]
The sum of three consecutive natural numbers each divisible by 5, is 225. The largest among them is
a) 70
b) 85
c) 75
d) 80
Answer »Answer: (d)
Let the required largest number be x.
According to the question,
x + x – 5 + x – 10 = 225
3x – 15 = 225
3x = 225 + 15 = 240
x = $240/3$ = 80
Question : 19 [SSC MTS 2013]
Find three consecutive numbers such that twice the first, three times the second and four times the third together make 191.
a) 20, 21, 22
b) 19, 20, 21
c) 21, 22, 23
d) 22, 23, 24
Answer »Answer: (a)
Numbers = x, x +1 and x + 2
2x + 3x + 3 + 4x + 8 = 191
9x = 191 – 11 = 180
x = 20
∴ Numbers = 20, 21 and 22
Question : 20 [SSC CGL 2002]
The sum of three consecutive odd natural numbers is 87. The smallest of these numbers is :
a) 23
b) 29
c) 31
d) 27
Answer »Answer: (d)
Let the three odd consecutive natural numbers be x, x + 2 and x + 4.
According to the question
x + x + 2 + x + 4 = 87
or 3x + 6 = 87
or 3x = 81; x = 27
Smallest number = 27
IMPORTANT quantitative aptitude EXERCISES
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Basic Number System Aptitude Questions Practice Test with PDF »
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Number System on Divisibility Multiple Add Subtract Live Test »
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Top 255+ Number System Fraction Aptitude Questions Answers »
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Top +299 Aptitude Number System (Find Unit Place) Mcq Quiz »
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Top Number System Aptitude (Smallest Largest Fraction) MCQ »
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199+ Aptitude Number System: Consecutive Numbers MCQ Quiz »
model 6 operations of consecutive numbers (odd, even, square, etc.) Shortcuts »
Click to Read...model 6 operations of consecutive numbers (odd, even, square, etc.) Online Quiz
Click to Start..number system Shortcuts and Techniques with Examples
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model 1 basic number system
Defination & Shortcuts … -
model 2 divisibility, multiples, add and subtract based number system
Defination & Shortcuts … -
model 3 fraction of numbers
Defination & Shortcuts … -
model 4 finding unit place of a number
Defination & Shortcuts … -
model 5 smallest and largest fraction/numbers
Defination & Shortcuts … -
model 6 operations of consecutive numbers (odd, even, square, etc.)
Defination & Shortcuts …
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