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Number System

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

50
49
48
47

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 is doubled and 9 is added. If the resultant is trebled, it becomes 75. What is that number?

3.5
8
6
None of these

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

Let the number be x. Then,3(2x + 9) = 752x = 16 => x = 8

Number System
If (72)² is subtracted from the square of a number, the answer thus obtained is 4617. What is the number ?

99
95
103
92

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

x² - (72)² = 467Therefore, x² = 4617 + 5184Therefore, x² = 9801  Therefore, x = 99

Number System
(4 86%of 6500) ÷ 36 =?

777.5
877.5
677.5
977.5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

877.5

Number System
The square root of 3 + “5 is :

“(5/2) + “(1/2)
“3 /2 + 1/”2
“5 /2 - 1/”2
“3 /2 - 1/”2

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

“(5/2) + “(1/2)

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

188
162
245
141

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

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