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Number System

Number System
If one third of 3/4 of a number is 21. Then find the number?

63
630
84
840

ANSWER DOWNLOAD EXAMIANS APP

Number System
What is the remainder when 263251 is divided by 9?

1
3
6
8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

If the sum of the digits of a number is divisible by 9, the number will be divisible by 9.2 + 6 + 3 + 2 + 5 + 1 = 19The nearest multiple of 9 is 18.19 - 18 = 1.

Number System
If the numerator of a fraction is decreased by 12.5% and the denominator is increased by 180% the resultant fraction is 1/2. What is the original fraction ?

7/5
3/5
1/5
8/5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the original fraction be x/y.∴ x x 87.5/100/y x 280/100 = 1/2or 87.5x/280y = 1/2∴ 175x = 280y∴ x/y = 280/175        = 8/5

Number System
The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference of the two digits of the number ?

4
2
3
1

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(10x + y) - (10y + x) = 36,9(x - y) = 36/9 = 4

Number System
If the sum of five consecutive even numbers A, B, C, D and E is 130, what is the product of A and E ?

720
660
780
840

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the consecutive even numbers be A = 2x, B = 2x + 2, C = 2x + 4, D = 2x + 6 and E = 2x + 8= A + B + C + D + E = 130= 10x + 20 = 130∴ x = 130 - 20/10 = 11Therefore, product of A and E= 22 x 30 = 660

Number System
√(17)² + (17)² + (5)² - 2 = ?

16
17
18
19

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = √49 + 289 + 25 - 2 = √361 = 19

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