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Number System

Number System
If 272/3 × 81-1/2 = 3x, the value of x is

1
2
0
3

ANSWER DOWNLOAD EXAMIANS APP

Number System
If the sum and difference of two numbers are 20 and 8 respectively, then the difference of their square is:

12
180
28
160

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be x and y. Then, x + y = 20 and x - y = 8x2 - y2 = (x + y)(x - y) = 20 * 8 = 160.

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

83
85
82
84

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

84

Number System
What least number should be added to 8602 to make it a perfect square ?

51
41
47
36

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

So, (93)² = 8649So, the required number to be added to make a perfect square = 8649 - 8602 = 47

Number System
The sum of the numbers is 264. If the first number be twice the second and third number be one-third of the first, then the second number is:

48
72
84
54

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the second number be x. Then, first number = 2x and third number = 2x/3.2x + x + 2x/3 = 26411x/3 = 264x = 72

Number System
The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:

20
None of these
40
30

ANSWER DOWNLOAD EXAMIANS APP
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