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Number System

Number System
Find the greatest number which leaves the same remainder when it divides 25, 57 and 105.

16
12
18
8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

105 - 57 = 4857 - 25 = 32105 - 25 = 80The H.C.F of 32, 48 and 80 is 16.

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

80
83
77
85

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
65% of 320+?=686

480
479
478
481

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

65% of 320+?=686 208+?=686?=686-208?=478

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
(12)² - (4.4)² - (0.04)² = ?

125.6384
131.6384
124.6384
129.6384

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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

Number System
[(18.6 x 4.5) + (7.8 ÷ 0.24)] ÷ 3.2 = ?

36.3125
46.3125
26.3125
25.3125

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 83.7 + 32.5/3.2 = 116.2/3.2 = 36.3125

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