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Number System

Number System
If the average of two numbers is 88.5 and one number is 5.5 less than the average. Find out the next number.

97
86
91
94

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

94

Number System
How many figures are required for numbering the pages of a book containing 1000 pages?

3892
2893
2883
6489

ANSWER DOWNLOAD EXAMIANS APP

Number System
In how many different ways can the letters of the word "MOBILIZE" be arranged ?

18456
19765
20160
17453

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160

Number System
The product of two natural numbers is 17. Then, the sum of the reciprocals of their squares is:

289/290
290/289
1/289
289

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be a and b. Then,ab = 17, a = 1 and b = 17So, 1/a2 + 1/b2 = (a2 + b2)/a2 b2 = (12 + 172)/(1 * 17)2 = 290/289

Number System
The Twenty-First Century will start on January 1 in the year

2000
2101
2001
2100

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

2001

Number System
If the sum of five consecutive even numbers A, B, C, D and E is 130, what is the product of A and E ?

720
780
660
840

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the consecutive even numbers be A = 2x, B = 2x + 2, C = 2x + 4, D = 2x + 6 and E = 2x + 8= A + B + C + D + E = 130= 10x + 20 = 130∴ x = 130 - 20/10 = 11Therefore, product of A and E= 22 x 30 = 660

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