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Number System

Number System
Find the number of factors of 300 excluding 1 and itself.

14
15
18
16

ANSWER DOWNLOAD EXAMIANS APP

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

83
80
85
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
If the of a two-digit number are interchanged, the number so obtained is greater than the original number by 18. If the sum of the two digits of the number is 14. What is the original number ?

68
66
62
64

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be 10x + y.No. formed by the interchange of digits = 10y + xWe have y - x = 2 .........(i)y + x = 14            .........(ii)Solving (i) and (ii), we get x = 6, and y = 8∴ the no. is 68.

Number System
If a number is multiplied by. three-fourth of itself, the value thus obtained is 10800. What is that number ?

260
60
120
180

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.∴ x x 3x/4 = 10800= x² = 10800 x 4/3 = 14400∴ x = √14400 = 120

Number System
7.8 x 4.5 x 4.2/0.14 = ?

1087
1053
1032
1012

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

7.8 x 4.5 x 4.2/0.14 = 1053

Number System
Which is the smallest fractions among the following ?

11/13
27/31
13/15
15/19

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

11/13 = 0.8461,13/15 = 0.8666,27/31 = 0.87,15/19 = 0.789

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