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Number System

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

5
11
3
7

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
5358 * 51 = ?

273268
273258
273348
273358

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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

Number System
The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:

None of these
40
20
30

ANSWER DOWNLOAD EXAMIANS APP

Number System
If (35)² is added to the square of a number the answer so obtained is 1394. What is the number ?

11
17
15
13

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x Therefore, x² + (35)² = 1394Therefore, x² = 1394 - (35)²                       = 1394 - 1225                       = 169Therefore, x = √169 = 13

Number System
How many figures are required for numbering the pages of a book containing 1000 pages?

3892
2893
2883
6489

ANSWER DOWNLOAD EXAMIANS APP

Number System
7432 ÷ 32 x ? = 2787

21
12
78
41

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

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

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