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Number System

Number System
What should come in place of (?) in the following series ? 10, 19, 30, 43, 58, ?

77
75
76
78

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The series is: +9, +11, +13, +15, +17

Number System
The average age of seven boys sitting in a row facing North is 26 years. If the average age of first three boys is 19 years and the average age of last three boys is 32 years, what is the age of the b

31 years
29 years
28 years
30 years

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Age of the fourth boy = (26 x 7 - 3 x 19 - 3 x 32) years = (182 - 57 - 96) years = 29 years

Number System
What should come in place of the question mark (?) in the given number series ? 888, 888, 444, 148, ?, 7.4

37
39
38
36

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let x be the missing number.Then888/888 = 1,888/444 = 2,444/148 = 3,148/x = 4= x = 148/4 = 37  and 37/7.4 = 5

Number System
If the of a two-digit number are interchanged, the number so obtained is greater than the original number by 18. If the sum of the two digits of the number is 14. What is the original number ?

64
62
66
68

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be 10x + y.No. formed by the interchange of digits = 10y + xWe have y - x = 2 .........(i)y + x = 14            .........(ii)Solving (i) and (ii), we get x = 6, and y = 8∴ the no. is 68.

Number System
What is the least number to be subtracted from 696 to make it a perfect square?

16
1
20
71

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The numbers less than 696 and are squares of certain numbers are 676, 625.The least number that should be subtracted from 696 to make it perfect square = 696 - 676 = 20.

Number System
Twenty times a positive integer is less than its square by 96. What is the integer?

24
Cannot be determined
20
30

ANSWER DOWNLOAD EXAMIANS APP
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