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Number System

Number System
3√68921 = ?

31
21
51
41

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

? = 3√68921= 3√41 x 41 x 41= 41

Number System
If (74)² is added to the square of a number the answer so obtained is 7780. What is the number ?

47
50
48
49

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.or, x² + (74)² = 7780or, x² = 7780 - 5476 = 2304∴ x = 48

Number System
A number when, 28 subtracted from it reduces to its one third. What is the value of 50% of that number?

21
42
24
84

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

2/3 x = 28 => x = 4242 * 1/2 = 21

Number System
On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is:

47719
47619
47649
48619

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

By hit and trail, we find that47619 * 7 = 333333.7) 333333 (47619     333333----------------        0

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

10
3
7
6

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

10

Number System
When (21)² is subtracted from the square of a number the answer obtained is 1584. What is the number ?

35
55
45
65

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x.According to the question,x² - (21)² = 1584= x² - 441 = 1584 = x² = 1584 + 441 = 2025∴ x = √2025 = 45

MORE MCQ ON Number System

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