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Number System

Number System
If the difference between a number and two-fifths of that number is 45 what is the number ?

76
78
77
75

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x ∴ x - 2x/5 = 45∴ x = 75

Number System
How many numbers between 300 and 800 can be by using digits 2, 4, 5, 6 and 0 ?

52
48
56
36

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

∴ Reqd . numbers = 3 x 4P2 = 3 x 12 = 36

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 = ?

625
525
325
425

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

625

Number System
In each of the following numbers, what should be the missing digit in the indicated place such that the number is a multiple of 11?

3
5
2
8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Divisibility of 11: If the difference of the sum of the digits at odd places and the sum of the digits at even places of a number is zero or a multiple of 11, then that number is divisible by 11.As per divisibility rule of 11, difference = (x + 21) - 18 = x + 3=> x + 3 = 11 => x = 8

Number System
On dividing number by 5, we get 3 as remainder. What will be the remainder when the square of this number is divided by 5?

2
1
4
0

ANSWER DOWNLOAD EXAMIANS APP

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 ?

3/5
1/5
7/5
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

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