## Number Solved Questions For IBPS, SBI and Other Bank Exams - Page 1

You will find 59 problems in 15 pages..

Number Problems Solved Questions (Page 1 of 15)

Below you will find important formulas of Number System. Following that you will find solved questions. These questions will help you in preparation for all bank exams including IBPS, SBI, RRB and other banks.

Basic Formulas:

Sum of first n natural numbers = n(n+1)/2

Sum of squares of first n natural numbers = n(n+1)(2n+1)/6

Sum of cubes of first n natural numbers = (n(n+1)/2) 2

Sum of first n even natural numbers = n(n+1)

Sum of first n odd natural numbers = n 2

Sum of n number of terms of a natural number series in which the difference between any two consecutive terms is same = n/2 (first term + last term)

Question 1

30% of 30% of ? = 90

a. 1000
b. 10
c. 10000
d. 100
e. 100000

Let the number we should find be N
Then, 30% of 30% of ? = 90
Or (30/100) x (30/100) x N = 90
Or (900/10000) x N = 90
Or N = (90 x 10000) / 900 = 1000

Question 2

?% of 50% of 200 = 20

a.200
b.20
c.400
d.40
e.800

Let the unknown number be L

Then, ?% of 50% of 200 = 20
Or L/100 x 50/100 x 200 = 20
Or L = (20 x 100 x 100) / (50 x 200) = 20

Question 3

25% of 125% of 100 = ?

a. 3125
b. 31.25
c. 3.125
d. .3125
e. 31250

Let the number to be found be M
Then, 25% of 125% of 100 = M
Or (25/100) x (125/100) x 100 = M
Or 31.25 = M

Question 4

10% of ?% of 1000 = 150

a. 150
b. 1500
c. 300
d. 3000
e. 30

Let the number to be found be N
Then, 10% of N% of 1000 = 150
Or (10/100)x(N/100)x1000 = 150
Or N = (150 x 100 x 100)/(10 x 1000) = 150

Number Problems Solved Questions (Page 1 of 15)

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