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NUMBER SYSTEM

Number System
On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is:

47619
48619
47719
47649

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

By hit and trail, we find that47619 * 7 = 333333.7) 333333 (47619     333333----------------        0

Number System
The difference between a number and its three-fifth is 50. What is the number?

None of these
100
125
75

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x - 3/5 x = 50 => 2/5 x = 50x = (50 * 5)/2 = 125.

Number System
If one-third of one fourth of a number is 15, then three-tenth of that number is:

45
35
25
54

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x. Then,1/3 of 1/4 of x = 15x = 15 * 12 = 180So, required number = (3/10 * 180) = 54.

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

None of these
3.5
8
6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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

Number System
Find the number which multiplied by 15 is increased by 196.

26
14
20
28

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x. Then,15x - x = 196x = 14

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