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Number System

Number System
4.78% of 1255 + 3.24% of 440=0.5% of ?

14849
12849
13849
11849

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

0.5 x ?/100 = 4.78 x 1255/100 + 3.24 x 440/100= 59.989 + 14.256∴ ? = 74.245 x 100/0.5 = 14849

Number System
What least number should be added to 8602 to make it a perfect square ?

41
47
51
36

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

So, (93)² = 8649So, the required number to be added to make a perfect square = 8649 - 8602 = 47

Number System
A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:

5
3
11
9

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the ten's digit be x and unit's digit be y. Then, number 10x + y.Number obtained by interchanging the digits = 10y + x.(10x + y) + (10y + x) = 11(x + y)which is divisible by 11.

Number System
Find the least value of 3x + 4y if x2y3 = 6.

10
7
6
3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

10

Number System
What is the sum of all the composite numbers up to 20?

130
128
131
132

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 = 132

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

N(N – 1)
N2+ 1
N2
N(N + 1)

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

N (N + 1)

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