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 : 1
The sum of all natural numbers between 100 and 200, which are multiples of 3 is :
a) 4980
b) 5000
c) 4950
d) 4900
Answer »Answer: (c)
Numbers divisible by 3 and lying between 100 and 200 are : 102, 105,..... 198
Let number of terms = n
198 = 102 + (n–1) 3
n–1 = ${198 - 102}/3$ = 32
n = 33
S = $n/2$(a+l) =$33/2$(102+ 198) = 4950
Question : 2 [SSC CGL Tier-I 2010]
Out of six consecutive natural numbers, if the sum of first three is 27, what is the sum of the other three ?
a) 25
b) 36
c) 35
d) 24
Answer »Answer: (b)
x + x + 1 + x + 2 = 27
3x + 3 = 27
3x = 24
x = 8
Three consecutive no's whose sum is 27 are 8, 9,10.
Hence, next 3 consecutive no's having 36 as sum are 11, 12 and 13
Question : 3
The sum of all the 3-digit numbers, each of which on division by 5 leaves remainder 3, is
a) 6995
b) 180
c) 1550
d) 99090
Answer »Answer: (d)
According to the question,
First number = a = 103; Last number = l = 998
If the number of such numbers be n, then,
998 = 103 + (n – 1) × 5
(n – 1) × 5= 998 – 103 = 895
n – 1 = $895/5$ = 179
n = 180
S = $n/2(a+l)$
=$180/2$(103 +998)
= 90 × 1101 = 99090
Question : 4 [SSC CGL Prelim 2008]
The sum of first 50 odd natural numbers is
a) 5200
b) 1000
c) 1250
d) 2500
Answer »Answer: (d)
S = 1 + 3 + 5 + ..... to 50 terms
Here, a = 1; d = 3 – 1 = 2; n = 50
S = $n/2[2a + (n - 1)d]$
= $50/2[2×1+ (50 - 1) ×2]$
= 25 (2 + 98) = 25 × 100 = 2500
Question : 5 [SSC CHSL 2011]
If the sum of five consecutive integers is S, then the largest of those integers in terms of S is
a) ${S + 5}/4$
b) ${S -10}/5$
c) ${S + 4}/4$
d) ${S +10}/5$
Answer »Answer: (d)
Sum of five consecutive integers = S
Third integer = $S/5$
Largest integer = $S/5$ + 2 = ${S+10}/5$
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
-
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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