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Number System

Number System
How many numbers between 300 and 800 can be by using digits 2, 4, 5, 6 and 0 ?

56
48
52
36

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

∴ Reqd . numbers = 3 x 4P2 = 3 x 12 = 36

Number System
732.96 + 405.38 - 604.08 - 105.44 + 222.86 = ?

651.68
631.68
621.68
641.68

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 1361.20 - 709.52 = 651.68

Number System
666 / 6 / 3 = ?

111
84
333
37

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

666 * 1/6 * 1/3 = 37

Number System
The square root of 0.0081 is:

0.91
0.9
0.009
0.09

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

0.09

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
What least number shall be added to 4700 to make it a perfect square ?

61
91
81
71

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(69)² = 4761 and (68)² = 4624Clerly 4624 < 4700 < 4761So 61 should be added to make 4700 a perfect square.

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