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Number System

Number System
What is the difference between the largest number and the least number written with the digits 7, 3, 1, 4?

6184
5084
6048
6084

ANSWER DOWNLOAD EXAMIANS APP

Number System
Which choice provides the answer in the following : If 2 * 3 = 36, 5 * 4 = 400, 6 * 2 = 144, 3 * 3 = 81; then, 5 * 5 = ?

425
325
525
625

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

625

Number System
Let R = qs—4. When s=8, R=16. When s=10, R is equal to

21
20
23
22

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

21

Number System
The difference between 45% of a number and 18% of the same number is 145.8. What is 30% of that number ?

245
188
162
141

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.45% of x - 18% of x = 145.8∴ x/100 (45 - 18) = 145.8∴ x = 145.8 x 100/27 = 540∴ 30% of 540 = 540 x 30/100 = 162

Number System
A number is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number?

3.5
None of these
6
8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x. Then,3(2x + 9) = 752x = 16 => x = 8

Number System
Which one of the following represents the sum of the first n even numbers?

N2
N2+ 1
N(N – 1)
N(N + 1)

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

N (N + 1)

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