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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
6048
6184
5084

ANSWER DOWNLOAD EXAMIANS APP

Number System
A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:

24
18
81
42

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the ten's and unit's digit be x and 8/x respectively. Then, (10x + 8/x) + 18 = 10 * 8/x + x 9x2 + 18x - 72 = 0 x2 + 2x - 8 = 0 (x + 4)(x - 2) = 0 x = 2 So, ten's digit = 2 and unit's digit = 4. Hence, required number = 24.

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

120
60
180
260

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
The sum of two numbers is 165 and the difference between them is 9. What is the average of these two numbers ?

83.5
82.5
85.5
84.5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x + y = 165x - y = 92x = 174                         ∴ x = 87 and y = 78∴ x + y/2 = 165/2               = 82.5

Number System
4550 ÷ 25% of ? = 130

125
135
130
140

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

4550 ÷ ? x 25/100 = 130= 4550 ÷ ?/4 = 130= 4550 x 4/? = 130= ? x 130 = 4550 x 4= ? = 4550 x 4/130 = 140

Number System
(12)² - (4.4)² - (0.04)² = ?

125.6384
124.6384
129.6384
131.6384

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(12)² - (4.4)² - (0.04)²= 144 - 19.36 - 0.0016= 124.64 - 0.0016= 124.6384

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