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Number System

Number System
If a number is subtracted from its square we get 272. Find the number?

14
22
17
24

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x2 – x = 272 => x =17

Number System
In how many different ways can the letters of the word "MOBILIZE" be arranged ?

17453
18456
19765
20160

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

The word MOBILIZE has eight letters in which I comes twice ∴ Number of arrangements = 8!/2! = 20160

Number System
The product of two consecutive odd numbers is 6723. Find is the greater number.

80
85
83
77

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the first odd number be x.Then, the other odd number would be x + 2.∴ x(x+2) = 6723= x2 + 2x = 6723= x2 + 2x = 6723= x2 + 2x - 6723 = 0= x2 + 83 - 81 x - 6723 = 0= x(x+83) - 81 (x + 83) = 0= (x + 83) (x - 81) = 0= (x + 83) (x - 81) = 0= x - 81 = 0∴ x = 81Hence, greater number = x + 2 = 81 + 2 = 83

Number System
1827÷ 36 x ?=162.4

3.2
2.6
1.9
4.3

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

3.2

Number System
The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers?

12/35
7/32
1/35
35/8

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the numbers be a and b. Then,a + b = 12 and ab = 35.(a + b)/ab = 12/35= (1/b + 1/a) = 12/35Sum of reciprocals of given numbers = 12/35.

Number System
A shopkeeper purchased 200 bulbs for Rs. 10 each. However, 5 bulbs were fused and had to be thrown away. The remaining were sold at Rs. 12 each. What will be percentage profit?

14
21
17
33

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

12

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