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Number System

Number System
3√68921 = ?

51
31
21
41

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 3√68921= 3√41 x 41 x 41= 41

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.

25
12.5
50
75

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

Number System
If 2^(2x-1) = 8^(3-x), then the value of x is:

2
9
5
6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

2

Number System
If A = 1, B = 3, C = 5 and so on, what do the numbers 3, 9, 7 stand for

CAR
BAT
CAT
BED

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

BED

Number System
The product of two consecutive odd numbers is 6723. Find is the greater number.

83
85
80
77

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the first odd number be x.Then, the other odd number would be x + 2.∴ x(x+2) = 6723= x2 + 2x = 6723= x2 + 2x = 6723= x2 + 2x - 6723 = 0= x2 + 83 - 81 x - 6723 = 0= x(x+83) - 81 (x + 83) = 0= (x + 83) (x - 81) = 0= (x + 83) (x - 81) = 0= x - 81 = 0∴ x = 81Hence, greater number = x + 2 = 81 + 2 = 83

Number System
Find the number, when 15 is subtracted from 7 times the number, the result is 10 more than twice of the number

5
15
4
7.5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.7x -15 = 2x + 10 => 5x = 25 => x = 5

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