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Number System

Number System
If the product of two successive positive integers is 4692, what is the smaller number ?

70
66
68
64

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

∵ 68 x 69 = 4692

Number System
The product of two consecutive odd numbers is 4095 What is the greater number ?

61
69
74
65

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the two consecutive odd numbers be 2x - 1 and 2x + 1.(2x - 1) (2x - 1) = 4095= 4x² - 1 = 4095= 4x² = 4096= x² = 1024∴ x = 32∴ The numbers are 63 and 65.Greater number = 65

Number System
How many figures are required to number the pages the pages of a book containing 365 pages?

987
977
967
897

ANSWER DOWNLOAD EXAMIANS APP

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
In how many different ways can the letters of the word 'FRUGAL'be arranged ?

660
556
515
720

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

In FRUGAL there ae six difference letters Therefore, 6 !                       = 6 x 5 x 4 x 3 x 2 x 1 = 720

Number System
The difference between 68% of a number and 35% of the same number is 1216. What is 28% of the number ?

1027.75
1031.75
1037.75
1043.75

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be xTherefore 68x / 100 - 35x / 100 = 1216      Therefore x = 1216 x 100 / 33Therefore 28% of x = 28x / 100 = 1216 x 100 / 33 x 28 / 100= 1216 x 100 x 28 / 33 x 1/100 = 1031.75

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