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Number System

Number System
How many times the keys of a typewriter have to be pressed in order to write first 400 counting numbers?

1200
1082
1092
1192

ANSWER DOWNLOAD EXAMIANS APP

Number System
The difference between 68% of a number and 35% of the same number is 1216. What is 28% of the number ?

1031.75
1043.75
1027.75
1037.75

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the no. be xTherefore 68x / 100 - 35x / 100 = 1216      Therefore x = 1216 x 100 / 33Therefore 28% of x = 28x / 100 = 1216 x 100 / 33 x 28 / 100= 1216 x 100 x 28 / 33 x 1/100 = 1031.75

Number System
The sum of five consecutive numbers is 190. What is the sum of the largest and the smallest number ?

74
75
73
76

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x + x + 1 + x + 2 + x + 3 + x + 4= 190= 5x + 10 = 190= 5x = 190 - 10 = 180= x = 180/5 = 36The largest number = 36 + 4 = 40∴ Required sum = 36 + 40 = 76

Number System
How many numbers up to 300 and 700 are divisible by 2, 3 and 7 both together?

11
9
10
8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

(700 – 300)/42 = 9 22/42 => 9 Numbers

Number System
106 * 106 - 94 * 94 = ?

2000
1906
2400
1904

ANSWER DOWNLOAD EXAMIANS APP

Number System
The product of two consecutive odd numbers is 4095 What is the greater number ?

69
61
65
74

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the two consecutive odd numbers be 2x - 1 and 2x + 1.(2x - 1) (2x - 1) = 4095= 4x² - 1 = 4095= 4x² = 4096= x² = 1024∴ x = 32∴ The numbers are 63 and 65.Greater number = 65

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