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Number System

Number System
Which one of the following is the sum of the numbers 1, 3, 5, 7, 9…. up to nth number?

N(N + 1)/2
N2
N(N + 1)
N2 + 1

ANSWER DOWNLOAD EXAMIANS APP

Number System
In a division sum, the remainder is 0. As student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient?

0
20
12
13

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Number = (12 * 35) = 420Correct quotient = 420/21 = 20

Number System
The product of two consecutive odd numbers is 4623. What is the product of the next two consecutive odd numbers ?

8795
7745
6782
5183

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

√4623 = 6767 x 69 = 4623∴ Required product = 71 x 73                               = 5183

Number System
If 35% of a number is 899.5, what is 68% of that number ?

2247.6
1747.6
1547.6
1847.6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Suppose the number is x.Then 35% of x = 899.5∴ 68% of x = 68/35 x 899.5 = 1747.6

Number System
The sum and the product of two numbers are 25 and 144 respectively, the difference of the number is?

7
11
5
3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x + y = 25xy = 144(x- y)2 = (x + y)2 – 4xy(x- y)2 = 625 – 576 => (x – y) = 7

Number System
A, B, C, D and E are consecutive even numbers respectively. The average of 5 numbers is 82. What is the product of C and E ?

6353
6363
6373
6383

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x + x + 1 + x + 2 + x + 3 + x + 4  = 5 x 82= 5x + 10 = 410 = 5x = 400= x = 400/5 = 80  ∴ A = 80C = 82and E = 84= C x E = 82 x 84 = 6383

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