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Number System

Number System
5525 ÷ 17 = √?

99225
93025
112225
105625

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

√? = 5525/17 = 325∴ ? = (325)² = 105625

Number System
63.602 + 153.756 + 94.754 - 84.321 - 122.204 = ?

141.587
140.587
142.587
143.587

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 312.112 - 170.525 = 141.587

Number System
The sum of the digits of a two-digit number is 12, and the difference between the number and the number obtained by interchanging the two digits of the number is 18. Find the number.

25
12.5
75
50

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be 10x + y.∴ x + y = 12    ...........(i)10x + y - (10x + x) = 18or 10x + y - 10y - x = 18or 9x - 9y = 18∴ x - y = 2From (i) and (ii), x = 7, y = 5∴ Number = 75

Number System
The average of five consecutive even numbers, p, q, r, s and t is 40. What is the product of 'r' and 's' ?

1680
1780
1480
1580

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be x, x + 2, x + 4, x + 6, and x + 8Avg = x + x + 2 + x + 4 + x + 6 + x + 8/5 = 40Therefore, 5x + 20 = 200Therefore, x = 180/5 = 36Therefore, r = x + 4 = 40                                 s =  x + 6 = 42Therefore, Product = 1680

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

1082
1192
1200
1092

ANSWER DOWNLOAD EXAMIANS APP

Number System
The sum of three consecutive numbers is 87. The greatest among these three number is:

28
29
30
26

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be x, x + 1 and x + 2 Then,x + (x + 1) + (x + 2) = 873x = 84x = 28Greatest number, (x + 2) = 30.

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