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Number System

Number System
(4.6 x 2.8 x 5.5) - (3.2 x 4.5 x 2.8) = ?

28.56
30.52
29.81
27.54

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = (4.6 x 2.8 x 5.5) - (3.2 x 4.5 x 2.8)   = 70.84 - 40.32   = 30.52

Number System
What should be the least number to be added to the 51234 number to make it divisible by 9?

3
5
6
4

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The least number to be added to the numbers to make them divisible by 9 is equal to the difference of the least multiple of 9 greater than the sum of the digits and sum of the digits.Sum of digits = 15.Nearest multiple of 9 greater than sum of digits = 18.Hence 3 has to be added.

Number System
A gardener wants to plant trees in his garden in such a way that the number of trees in each row should be the same. If there are 4 rows or 5 rows or 6 rows, then no tree will be left. Find the least

60
30
240
120

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The least number of trees that are required = LCM(4, 5, 6) = 60.

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

83
77
85
80

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 fractions 1/7, 3/5, 2/5, 5/6 and 9/11 are arranged in descending order of their values, which one will be the fourth number?

3/5
2/5
1/5
4/5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

1/4 = 14. 3/5  = 6.2/5 = 4.5/6 = 83.9/11 = 82.Therefore, 83 > 82 > 6 > 14

Number System
Find the number, when 15 is subtracted from 7 times the number, the result is 10 more than twice of the number

4
5
15
7.5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.7x -15 = 2x + 10 => 5x = 25 => x = 5

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