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Number System

Number System
Which one of the following represents the sum of the first n even numbers?

N(N + 1)
N2+ 1
N(N – 1)
N2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

N (N + 1)

Number System
5358 * 51 = ?

273258
273358
273348
273268

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

5358 * 51 = 5358 * (50 + 1) = 5358 * 50 + 5358 * 1= 267900 + 5358 = 273258

Number System
The difference between 71% of a number and 46% and of the same number is 212. What is 75% of that number

636
673
845
724

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.∴ 71% of x - 46% of x = 212∴ (71 - 46)% of x = 212∴ 25/100 x x = 212∴ x = 212 x 4 = 848∴ 75% of 848 = 848 x 75/100  = 636

Number System
If the three fourth of a number is subtracted from the number; the value so, obtained is 163. What is that number ?

689
692
652
678

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Number x (1 - 3/4) = 163∴ Number = 163 x 4 = 652

Number System
7432 ÷ 32 x ? = 2787

41
12
21
78

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

7432/32 x ? = 2787= ? = 2787 x 32/7432 = 12

Number System
Find the nearest to 25268 which is exactly divisible by 467?

25308
25208
25228
25218

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