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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?

6084
5084
6184
6048

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 ?

1/5
3/5
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

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

85
80
83
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 least value of 3x + 4y if x2y3 = 6.

7
3
10
6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

10

Number System
Which number should replace question mark (?) in the following equation ? ?/342 = 38/?

118
116
114
112

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(?)² = 342 x 38Therefore, ? = √342 x 38 = √38 x 9 x 38 = 38 x 3 = 114

Number System
A certain number successively divided by 2, 5 and 7 leaves remainders 1, 2 and 3 respectively. When the same number is divided by 70, what is the remainder?

33
34
35
36

ANSWER DOWNLOAD EXAMIANS APP
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