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Number System

Number System
Which is the smallest fractions among the following ?

27/31
15/19
13/15
11/13

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

11/13 = 0.8461,13/15 = 0.8666,27/31 = 0.87,15/19 = 0.789

Number System
What is the sum of all the prime numbers from 20 to 40?

117
120
118
119

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

23 + 29 + 31 + 37 = 120

Number System
On dividing a number by 68, we get 269 as quotient and 0 as remainder. On dividing the same number by 67, what will be the remainder?

0
2
1
3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Number = 269 * 68 + 0 = 1829267) 18292 (273       18291         --------                1Required number = 1.

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 ?

660
720
780
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

Number System
What number should replace both the question marks (?) in the following question ?

83
82
85
84

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

84

Number System
The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number.

75
25
50
12.5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be 10x + y.∴ x + y = 12    ...........(i)10x + y - (10x + x) = 18or 10x + y - 10y - x = 18or 9x - 9y = 18∴ x - y = 2From (i) and (ii), x = 7, y = 5∴ Number = 75

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