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Number System

Number System
The square root of 3 + “5 is :

“3 /2 - 1/”2
“3 /2 + 1/”2
“5 /2 - 1/”2
“(5/2) + “(1/2)

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

“(5/2) + “(1/2)

Number System
In a two-digit number, the digit in unit's place is two more than three times the digit in ten's place. If the sum of the two digits is 10, what is the number ?

18
24
28
22

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be 10x + y.∴ y = 3x + 2 .......(i)And, x + y = 10 ......(ii)From (i) and (ii), x = 2, y = 8∴ Number = 28

Number System
If (17)3 is subtracted from the square of a number, the answer so obtained is 2143. What is the number ?

81
82
83
84

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x² - (17*17*17)  = 2143or x² = 2143 + 4913 = 7056∴ x = 84

Number System
The cost of 87 pens and 29 pencils is `783. What is the cost of 90 pens and 30 pencils ?

Rs. 800
Rs. 830
Rs. 820
Rs. 810

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the price of a pen be 'x' and that of pencil be 'y' Then 87x + 29y = 783Multiplying eqn (i) by 30/29 we get (87x) x 30/29  + (29y) 30/29 = 783 x 30/29∴ 90x + 30y = 810

Number System
How many numbers up to 100 are divisible by 7?

93
14
100
107

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

100/7 = 14 2/7 => 14 Numbers

Number System
If the fractions8/5,7/2,9/5,5/4,4/5 are arranged in descending order of their values, which one will be fourth?

5/4
7/9
11/13
1/3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

5/4

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