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Number System

Number System
Sum of the digits number is 8 and their product is 12. Find the difference between the digits?

2
6
None
4

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x + y = 8xy = 12(x – y)2 = (x + y)2 – 4xy (x – y)2 = 64 – 48 => (x – y) = 4

Number System
8988 / 8 / 4 = ?

561.75
4494
2247
280.875

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

8988 * 1/8 * 1/4 = 2247/8 = 280.875

Number System
What should come in place of question mark (?)? 8 : 1 1 : : 72:

89
109
99
79

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let ? = xTherefore 8 : 11 : 72 : xTherefore x = (11 x 72) / 8 = 99

Number System
The difference between 72% of a number and 49% of the same number is 575. What is 9% of that number ?

275
245
225
295

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be x.Therefore, 72% of x - 49% of x = 575Therefore, (72 - 49)% of x = 575Therefore, 9% of x = 575/23 x 9 = 225

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

Cannot be determined
30
20
24

ANSWER DOWNLOAD EXAMIANS APP

Number System
A number when multiplied by five times of itself give the value equal to 1445. What is the number ?

17
15
18
16

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x x 5x = 1445= 5x² = 1445= x² = 289∴ x = 17

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