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Number System

Number System
(√6 + 1)² = ? + 2√6

7
6
8
5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = (√6 + 1)² - 2√6= (√6)² + 2 x √6 + 1 + 1² - 2√6= 6 + 2√6 + 1 - 2√6 = 6 + 1 = 7

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

1260
1300
1280
1240

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Number of ways = 7!/2!2! = 1260(∵ L and E come twice)

Number System
The difference between 45% of a number and 18% of the same number is 145.8. What is 30% of that number ?

245
188
141
162

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.45% of x - 18% of x = 145.8∴ x/100 (45 - 18) = 145.8∴ x = 145.8 x 100/27 = 540∴ 30% of 540 = 540 x 30/100 = 162

Number System
480% of 350 + 620% of 275 = ?

2385
4385
3385
5385

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 480 x 350/100 + 620 x 275/100= 1680 + 1705 = 3385

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
(800 / 64) * (1296 / 36) = ?

460
None of these
500
420

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Given Exp.= 800/64 * 1296/36 = 12.5 * 36 = 450

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